Seperti apa ya, proses pembekuan darah itu? Lalu, apa saja komponen penyusun darah serta fungsinya? Yuk, cari tahu jawabannya di artikel berikut!
—
Sore itu, Ucup sedang berlari santai mengitari kompleks tempat tinggalnya. Biasanya sih, Ucup cuma rebahan aja, tapi sore ini, Ucup memutuskan untuk olahraga supaya badannya terasa lebih bugar.
Nggak deng, bohong.
Ucup lari sore gara-gara disuruh Emaknya aja. Soalnya selama sekolah online, Ucup jarang olahraga dan kerjanya rebahan mulu.
“Sana lari sore tuh, mumpung lagi nggak hujan!” ujar Emak Ucup sebelum akhirnya Ucup berangkat dengan baju olahraganya yang (lumayan) keren.
Tapi, waktu lagi asyik berlari, tiba-tiba Ucup tersandung batu dan jatuh ke tanah.
Bruk!
“Aduh! Aww.. sakit..” ujar Ucup kesakitan.
Yaahh, nggak jadi keliatan keren deh, si Ucup 🙁
Ucup berusaha bangkit sambil melihat keadaan sekitar. Hufttt, untung lagi sepi dan nggak ada siapa-siapa. Kalau dilihat tetangga kan malu.
Setelah bangkit, barulah Ucup menyadari, ternyata ia terluka di bagian lutut dan berdarah. Huhu, kasian si Ucup. Kamu pernah mengalami kejadian kayak Ucup juga, nggak?
Nah, kalau lagi luka terus berdarah gitu, biasanya nggak perlu waktu lama sampai akhirnya luka itu berhenti mengeluarkan darah. Kok bisa gitu, ya?
Jawabannya adalah karena tubuh kita memiliki mekanisme pembekuan darah atau disebut juga sebagai koagulasi. Apa itu mekanisme pembekuan darah?
Mekanisme pembekuan darah adalah kondisi menggumpalnya darah di sekitar luka, untuk menghentikan perdarahan yang terjadi. Mekanisme ini otomatis dilakukan oleh tubuh supaya tubuh nggak kehilangan terlalu banyak darah saat terluka.
Baca juga: Jenis-Jenis Sistem Peredaran Darah pada Manusia
Seperti apa sih, proses pembekuan darah pada manusia? Yuk, kita cari tahu!
Proses Pembekuan Darah
Ketika kita terluka dan mengeluarkan darah, trombosit akan segera melekat di dinding jaringan pembuluh darah dan membentuk sumbatan yang bisa memberikan perlindungan darurat, supaya darah yang keluar nggak berlangsung secara terus-menerus. Nah, mekanisme ini bisa digambarkan dengan skema berikut. Check it out!
Jadi, ketika kita terluka dan berdarah, trombosit akan pecah dan mengeluarkan enzim trombokinase. Trombokinase ini akan mengubah senyawa protrombin menjadi trombin dengan bantuan Ca2+ (kalsium) dan vitamin K. Selanjutnya, trombin akan mengubah protein fibrinogen yang ada di plasma darah menjadi benang-benang fibrin. Benang-benang fibrin inilah yang akan menyumbat luka, sehingga darah berhenti mengalir.
Nah, sudah paham kan, bagaimana proses pembekuan darah terjadi?
“Sudah paham sih, tapi sekarang malah jadi kepikiran hal lain, nih! Kenapa ya, darah kita warnanya merah? Bukannya kita juga punya sel darah putih?”
Pertanyaan bagus, Ucup! Eh, salah, maksudnya teman-teman! Tapi, untuk menjawab pertanyaan itu, kita harus membahas komponen-komponen penyusun darah, nih. Yuk, kita bahas!
Komponen Penyusun Darah
Ternyata, darah kita itu terdiri atas beberapa komponen, lho! Bukan cuma sel darah merah aja, tapi juga ada sel darah putih, trombosit (keping darah), serta plasma darah. Lalu, kenapa darah kita berwarna merah?
Nah, jika dilihat dari gambar di atas, komponen penyusun darah itu ada berbagai macam. Mulai dari plasma darah, sel darah merah, sel darah putih, serta trombosit (keping darah). Sel darah merah, sel darah putih, dan trombosit memiliki komposisi sebanyak 45% di dalam darah. Sementara sisanya (55%) merupakan plasma darah. Berarti, komponen penyusun darah yang terbesar adalah plasma darah.
Baca juga: Macam-Macam Penyakit dan Kelainan pada Sistem Peredaran Darah Manusia
Plasma darah sendiri warnanya adalah putih kekuningan. Nah, kalau plasma darah sudah bercampur dengan sel darah putih, keping darah, serta sel darah merah yang warnanya merah pekat, tentu saja warnanya akan ikut menjadi merah ya, teman-teman! Karena warna merah yang dimiliki sel darah merah sangat pekat dan dominan. Oleh karena itu, darah kita tetap berwarna merah meskipun komponennya bukan hanya sel darah merah.
Sekarang kita bahas satu per satu mengenai komponen penyusun darah, yuk!
1. Plasma Darah
Plasma darah merupakan cairan putih kekuningan yang tersusun dari 92% air, 7% protein plasma (Albumin, Globulin, dan Fibrinogen), dan 1% mineral, oksigen, serta bahan organik dan anorganik lain. Albumin pada plasma darah berfungsi untuk memelihara tekanan osmotik. Sedangkan globulin berfungsi untuk membentuk zat antibodi. Selain itu, ada juga fibrinogen yang berperan penting dalam proses pembekuan darah.
2. Sel Darah Merah (Eritrosit)
Eritrosit adalah sel darah yang bersirkulasi di seluruh tubuh dan menyalurkan oksigen ke jaringan tubuh. Pada manusia, sel darah merah berbentuk bikonkaf (cekungan ganda) dan tidak mempunyai inti sel. Sel darah merah mengandung protein hemoglobin yang digunakan dalam transpor oksigen. Nah, warna merah pada sel darah merah itu dipengaruhi oleh hemoglobin, guys!
Usia sel darah merah di tubuh kita bisa mencapai 120 hari. Sel darah merah yang sudah rusak atau sudah tua akan dipecah di dalam hati dan limfa. Kemudian, sel darah merah akan kembali diproduksi di sumsum tulang belakang. Produksi sel darah merah ini dikontrol oleh hormon eritropoietin yang dilepaskan oleh ginjal.
3. Sel Darah Putih (Leukosit)
Leukosit mempunyai bentuk yang tidak tetap, tidak berwarna, dan mempunyai inti sel. Di dalam darah, komposisi sel darah putih sangat sedikit, yaitu kurang dari 1%. Sel darah putih memiliki fungsi utama untuk merespon imun, mengenali, dan mematikan kuman penyakit. Perlu kamu ketahui juga bahwa ukuran sel darah putih itu lebih besar daripada sel darah merah, lho!
4. Keping Darah (Trombosit)
Keping darah atau trombosit adalah fragmen sel yang terlibat dalam pembekuan darah. Hayoo, masih inget nggak, peran trombosit dalam proses pembekuan darah? Kalau lupa, kamu bisa cek kembali skema proses pembekuan darah di atas, ya!
Trombosit ini bentuknya tidak teratur, tidak mempunyai inti sel, serta berukuran lebih kecil dibandingkan sel darah merah maupun putih. Sayangnya, trombosit hanya berumur 8 hari sebelum akhirnya dirombak di sumsum merah.
Untuk tahu bentuk dari masing-masing komponen penyusun darah, kamu bisa lihat pada gambar ini ya, guys!
Bentuk komponen-komponen penyusun darah (Sumber: britannica.com)
Fungsi Sistem Peredaran Darah
Kenapa sih, di dalam tubuh kita harus ada darah? Kan serem, kalau lagi luka jadi merah-merah gitu 🙁
Eits, meskipun terkadang tampak menyeramkan karena berwarna merah gelap, kita tetap butuh darah lho, karena darah merupakan salah satu komponen penting yang menyusun sistem peredaran darah dalam tubuh.
Sistem peredaran darah merupakan suatu sistem organ yang melibatkan jantung dan pembuluh darah yang berfungsi untuk menyirkulasikan darah di dalam tubuh. Sistem peredaran darah berfungsi untuk:
-
Transportasi zat (oksigen, karbondioksida, hormon, dan sari-sari makanan).
-
Mempertahankan suhu tubuh dengan mengedarkan panas tubuh secara merata ke seluruh tubuh.
-
Pertahanan tubuh dari serangan patogen.
Coba bayangin kalau di tubuh kita nggak ada darah. Malah jadi lebih serem, kan?
Nah, itu dia pembahasan kita tentang proses pembekuan darah, komponen-komponen penyusun darah, serta fungsi sistem peredaran darah. Sebentarlagi, kamu akan menghadapi PAS, nih! Kalau kamu ingin mendalami materi dan memperbanyak latihan soal, yuk, langsung meluncur ke ruanguji! Dengan ribuan bank soal dan pembahasan yang menarik, dijamin persiapan kamu lebih matang!
Referensi:
Irnaningtyas, Istiadi Y. (2016). Biologi untuk SMA/MA Kelas XI Kurikulum 2013 yang Disempurnakan Edisi Revisi. Jakarta: Erlangga.
Sumber Gambar:
Gambar ‘Bentuk komponen-komponen penyusun darah’ [Daring]. Tautan: https://www.britannica.com/science/blood-biochemistry (Diakses: 2 Desember 2021).
Artikel ini telah diperbarui pada 16 November 2022.
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<h1 class="content-title">
Proses Pembekuan Darah dan Komponen Penyusun Darah | Biologi Kelas 11 </h1>
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<p class="content-author"><a href="https://www.ruangguru.com/blog/author/kenya-swawikanti" class="">Kenya Swawikanti</a> </p>
<p class="content-info"><span>November 16, 2022 • </span> <span>6 minutes read</span></p>
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<p style="text-align: center;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/proses%20pembekuan%20darah%20dan%20komponen%20penyusun%20darah.jpg" alt="proses pembekuan darah dan komponen penyusun darah" width="820" loading="lazy" style="width: 820px; margin-left: auto; margin-right: auto; display: block;"></p>
<blockquote>
<p style="text-align: center; font-size: 16px;"><em><span style="color: #000000;">Seperti apa ya, proses pembekuan darah itu? Lalu, apa saja komponen penyusun darah serta fungsinya? Yuk, cari tahu jawabannya di artikel berikut!</span></em></p>
<p style="text-align: center; font-size: 16px;"><em><span style="color: #000000;">—</span></em></p>
</blockquote>
<p style="text-align: justify;"><span id="more-1015"></span></p>
<p style="text-align: justify;">Sore itu, Ucup sedang berlari santai mengitari kompleks tempat tinggalnya. Biasanya sih, Ucup cuma rebahan aja, tapi sore ini, Ucup memutuskan untuk olahraga supaya badannya terasa lebih bugar.</p>
<p style="text-align: justify;">Nggak deng, bohong.</p>
<p style="text-align: justify;">Ucup lari sore gara-gara disuruh Emaknya aja. Soalnya selama sekolah <em>online</em>, Ucup jarang olahraga dan kerjanya rebahan mulu.</p>
<p style="text-align: justify;"><em>“Sana lari sore tuh, mumpung lagi nggak hujan!”</em> ujar Emak Ucup sebelum akhirnya Ucup berangkat dengan baju olahraganya yang (lumayan) keren.</p>
<p style="text-align: justify;">Tapi, waktu lagi asyik berlari, tiba-tiba Ucup tersandung batu dan jatuh ke tanah.</p>
<p style="text-align: justify;"><em>Bruk!</em></p>
<p style="text-align: justify;"><em>“Aduh! Aww.. sakit..” </em>ujar Ucup kesakitan.<span style="color: #000000;"></span></p>
<p style="text-align: justify;">Yaahh, nggak jadi keliatan keren deh, si Ucup 🙁</p>
<p style="text-align: justify;">Ucup berusaha bangkit sambil melihat keadaan sekitar. <em>Hufttt</em>, untung lagi sepi dan nggak ada siapa-siapa. Kalau dilihat tetangga kan malu.</p>
<p style="text-align: justify;">Setelah bangkit, barulah Ucup menyadari, ternyata ia terluka di bagian lutut dan <a href="/blog/sistem-peredaran-darah" rel="noopener"><span style="font-weight: bold;">berdarah</span></a>. <em>Huhu</em>, kasian si Ucup. Kamu pernah mengalami kejadian kayak Ucup juga, nggak?</p>
<p style="text-align: justify;">Nah, kalau lagi luka terus berdarah gitu, biasanya nggak perlu waktu lama sampai akhirnya luka itu berhenti mengeluarkan darah. Kok bisa gitu, ya?</p>
<p style="text-align: justify;">Jawabannya adalah karena tubuh kita memiliki <span style="font-weight: bold;">mekanisme pembekuan darah</span> atau disebut juga sebagai <span style="font-weight: bold;">koagulasi</span>. Apa itu mekanisme pembekuan darah?</p>
<p style="text-align: justify;"><span style="font-weight: normal;">Mekanisme pembekuan darah adalah</span><span style="font-weight: bold;"> kondisi menggumpalnya darah di sekitar luka, untuk menghentikan perdarahan yang terjadi</span>. Mekanisme ini otomatis dilakukan oleh tubuh supaya tubuh nggak kehilangan terlalu banyak darah saat terluka.</p>
<p style="text-align: justify; font-weight: bold;">Baca juga: <a href="/blog/sistem-peredaran-darah" rel="noopener">Jenis-Jenis Sistem Peredaran Darah pada Manusia</a></p>
<p style="text-align: justify;">Seperti apa sih, proses pembekuan darah pada manusia? Yuk, kita cari tahu!</p>
<p style="text-align: justify;"> </p>
<h2 style="text-align: justify; font-weight: bold; font-size: 20px;">Proses Pembekuan Darah</h2>
<p style="text-align: justify;">Ketika kita terluka dan mengeluarkan darah, trombosit akan segera <span style="font-weight: bold;">melekat di dinding jaringan pembuluh darah</span> <span style="font-weight: bold;">dan membentuk sumbatan </span><span style="font-weight: normal;">yang bisa memberikan perlindungan darurat,</span> supaya darah yang keluar nggak berlangsung secara terus-menerus. Nah, mekanisme ini bisa digambarkan dengan skema berikut. <em>Check it out!</em></p>
<p style="text-align: justify;"><em><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/skema%20proses%20pembekuan%20darah.jpg" alt="skema proses pembekuan darah" width="600" loading="lazy" style="width: 600px; margin-left: auto; margin-right: auto; display: block;"></em></p>
<p style="text-align: justify;">Jadi, ketika kita terluka dan berdarah, <span style="font-weight: bold;">trombosit akan pecah</span> dan mengeluarkan <span style="font-weight: bold;">enzim trombokinase</span>. Trombokinase ini akan <span style="font-weight: bold;">mengubah senyawa protrombin menjadi trombin</span> dengan bantuan <span style="font-weight: bold;">Ca<sup>2+</sup></span> (kalsium) dan <span style="font-weight: bold;">vitamin K</span>. Selanjutnya, <span style="font-weight: bold;">trombin akan mengubah protein fibrinogen</span> yang ada di plasma darah <span style="font-weight: bold;">menjadi benang-benang fibrin</span><span style="font-weight: normal;">. Benang-benang fibrin inilah yang akan menyumbat luka, sehingga darah berhenti mengalir.</span></p>
<p style="text-align: justify;">Nah, sudah paham kan, bagaimana proses pembekuan darah terjadi?</p>
<p style="text-align: justify;"><em>“Sudah paham sih, tapi sekarang malah jadi kepikiran hal lain, nih! Kenapa ya, darah kita warnanya merah? Bukannya kita juga punya sel darah putih?”</em></p>
<p style="text-align: justify;">Pertanyaan bagus, Ucup! Eh, salah, maksudnya teman-teman! Tapi, untuk menjawab pertanyaan itu, kita harus membahas komponen-komponen penyusun darah, nih. Yuk, kita bahas!</p>
<p style="text-align: justify;"> </p>
<h2 style="text-align: justify; font-weight: bold; font-size: 20px;">Komponen Penyusun Darah</h2>
<p style="text-align: justify;"><span style="color: #000000;">Ternyata, darah kita itu terdiri atas beberapa komponen, lho! Bukan cuma <span style="font-weight: bold;">sel darah merah</span> aja, tapi juga ada <span style="font-weight: bold;">sel darah putih, trombosit (keping darah)</span>, serta <span style="font-weight: bold;">plasma darah</span>. Lalu, kenapa darah kita berwarna merah?</span></p>
<p style="text-align: justify;"><span style="color: #000000;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/komponen%20penyusun%20darah.jpg" alt="komponen penyusun darah" width="600" loading="lazy" style="width: 600px; margin-left: auto; margin-right: auto; display: block;"></span></p>
<p style="text-align: justify;"><span style="color: #000000;">Nah, jika dilihat dari gambar di atas, komponen penyusun darah</span><span style="color: #000000;"> itu ada berbagai macam. Mulai dari plasma darah, sel darah merah, sel darah putih, serta trombosit (keping darah). <span style="font-weight: bold;">Sel darah merah, sel darah putih, dan trombosit</span> memiliki komposisi <span style="font-weight: bold;">sebanyak 45%</span> di dalam darah. Sementara sisanya <span style="font-weight: bold;">(55%) merupakan plasma darah</span>. Berarti, komponen penyusun darah yang terbesar adalah plasma darah. </span></p>
<p style="text-align: justify; font-weight: bold;"><span style="color: #000000;">Baca juga: <a href="/blog/biologi-kelas-11-apa-saja-penyakit-dan-kelainan-pada-sistem-peredaran-darah" rel="noopener">Macam-Macam Penyakit dan Kelainan pada Sistem Peredaran Darah Manusia</a></span></p>
<p style="text-align: justify;"><span style="color: #000000;"><span style="font-weight: normal;">Plasma darah sendiri </span>warnanya adalah putih kekuningan. </span><span style="color: #000000;">Nah, kalau plasma darah sudah bercampur dengan sel darah putih, keping darah, serta sel darah merah yang warnanya merah pekat, tentu saja warnanya akan ikut menjadi merah ya, teman-teman! Karena <span style="font-weight: bold;">warna merah yang dimiliki sel darah merah sangat pekat dan dominan</span>. Oleh karena itu, darah kita <span style="font-weight: bold;">tetap berwarna merah meskipun komponennya bukan hanya sel darah merah</span>.</span></p>
<p style="text-align: justify;"><span style="color: #000000;">Sekarang kita bahas satu per satu mengenai komponen penyusun darah, yuk!</span></p>
<p style="text-align: justify;"> </p>
<h3 style="text-align: justify; font-weight: bold; font-size: 16px;"><span style="color: #000000;">1. Plasma Darah</span></h3>
<p style="text-align: justify;"><span style="color: #000000;">Plasma darah merupakan <span style="font-weight: bold;">cairan putih kekuningan </span><span style="font-weight: normal;">yang tersusun dari </span><span style="font-weight: bold;">92% air, 7% protein plasma (Albumin, Globulin, dan Fibrinogen), dan 1% mineral, oksigen, serta bahan organik dan anorganik lain</span>. <span style="font-weight: normal;">Albumin</span> pada plasma darah berfungsi untuk memelihara tekanan osmotik. Sedangkan <span style="font-weight: normal;">globulin </span>berfungsi untuk membentuk zat antibodi. Selain itu, ada juga <span style="font-weight: normal;">fibrinogen </span>yang berperan penting dalam proses pembekuan darah.</span></p>
<p style="text-align: justify;"> </p>
<h3 style="text-align: justify; font-weight: bold; font-size: 16px;"><span style="color: #000000;">2. Sel Darah Merah (Eritrosit)</span></h3>
<p style="text-align: justify;"><span style="color: #000000;">Eritrosit adalah <span style="font-weight: normal;">sel darah yang</span><span style="font-weight: bold;"> bersirkulasi di seluruh tubuh </span><span style="font-weight: normal;">dan</span><span style="font-weight: bold;"> menyalurkan oksigen </span><span style="font-weight: normal;">ke jaringan tubuh</span>. Pada manusia, sel darah merah berbentuk <span style="font-weight: bold;">bikonkaf</span> (cekungan ganda) dan <span style="font-weight: bold;">tidak mempunyai inti sel</span>. Sel darah merah mengandung protein <span style="font-weight: normal;">hemoglobin</span> yang digunakan dalam transpor oksigen. Nah, <span style="font-weight: bold;">warna merah </span><span style="font-weight: normal;">pada sel darah merah itu</span><span style="font-weight: bold;"> dipengaruhi oleh hemoglobin</span><span style="font-weight: normal;">, <em>guys</em>!</span></span></p>
<p style="text-align: justify;"><span style="color: #000000;">Usia sel darah merah di tubuh kita bisa mencapai <span style="font-weight: bold;">120 hari</span>. Sel darah merah yang sudah rusak atau sudah tua akan dipecah di dalam hati dan limfa. Kemudian, sel darah merah akan kembali <span style="font-weight: bold;">diproduksi di sumsum tulang belakang</span>. Produksi sel darah merah ini dikontrol oleh hormon <span style="font-weight: normal;">eritropoietin</span> yang dilepaskan oleh ginjal.</span></p>
<p style="text-align: justify;"> </p>
<h3 style="text-align: justify; font-weight: bold; font-size: 16px;"><span style="color: #000000;">3. Sel Darah Putih (Leukosit)</span></h3>
<p style="text-align: justify;"><span style="color: #000000;">Leukosit mempunyai <span style="font-weight: bold;">bentuk yang tidak tetap, tidak berwarna, dan mempunyai inti sel</span>. Di dalam darah, komposisi sel darah putih sangat sedikit, yaitu <span style="font-weight: bold;">kurang dari 1%</span>. </span><span style="color: #000000;">Sel darah putih memiliki fungsi utama untuk <span style="font-weight: bold;">merespon imun, mengenali, dan mematikan kuman penyakit</span>. Perlu kamu ketahui juga bahwa ukuran sel darah putih itu lebih besar daripada sel darah merah, lho!</span></p>
<p style="text-align: justify;"> </p>
<h3 style="text-align: justify; font-weight: bold; font-size: 16px;"><span style="color: #000000;">4. Keping Darah (Trombosit)</span></h3>
<p style="text-align: justify;">Keping darah atau trombosit adalah <span style="font-weight: bold;">fragmen sel yang terlibat dalam pembekuan darah</span>. <em>Hayoo</em>, masih inget nggak, peran trombosit dalam proses pembekuan darah? Kalau lupa, kamu bisa cek kembali skema proses pembekuan darah di atas, ya!</p>
<p style="text-align: justify;">Trombosit ini <span style="font-weight: bold;">bentuknya tidak teratur, tidak mempunyai inti sel</span>, serta <span style="font-weight: bold;">berukuran lebih kecil dibandingkan sel darah merah maupun putih</span>. Sayangnya, trombosit hanya berumur <span style="font-weight: bold;">8 hari</span> sebelum akhirnya dirombak di sumsum merah.</p>
<p style="text-align: justify;">Untuk tahu bentuk dari masing-masing komponen penyusun darah, kamu bisa lihat pada gambar ini ya, <em>guys</em>!</p>
<p style="text-align: justify;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/bentuk%20komponen%20penyusun%20darah.jpg" alt="bentuk komponen penyusun darah" width="600" loading="lazy" style="width: 600px; margin-left: auto; margin-right: auto; display: block;"></p>
<p style="text-align: center;"><em>Bentuk komponen-komponen penyusun darah (Sumber: britannica.com)</em></p>
<p style="text-align: center;"> </p>
<h2 style="text-align: justify; font-weight: bold; font-size: 20px;"><span style="color: #000000;">Fungsi Sistem Peredaran Darah</span></h2>
<p style="text-align: justify;"><span style="background-color: transparent;">Kenapa sih, di dalam tubuh kita harus ada darah? Kan serem, kalau lagi luka jadi merah-merah gitu 🙁</span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><em>Eits</em>, meskipun terkadang tampak menyeramkan karena berwarna merah gelap, kita tetap butuh darah lho, karena darah merupakan salah satu komponen penting yang <span style="font-weight: bold;">menyusun sistem peredaran darah dalam tubuh</span>.</span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/fungsi%20sistem%20peredaran%20darah.jpg" alt="fungsi sistem peredaran darah" width="600" loading="lazy" style="width: 600px; margin-left: auto; margin-right: auto; display: block;"></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="font-weight: bold;">Sistem peredaran darah</span> merupakan suatu sistem organ yang melibatkan <span style="font-weight: bold;">jantung</span> dan <span style="font-weight: bold;">pembuluh darah</span> yang berfungsi untuk menyirkulasikan <span style="font-weight: bold;">darah</span> di dalam tubuh. </span><span style="background-color: transparent;">Sistem peredaran darah berfungsi untuk:</span></p>
<ul>
<li style="font-size: 16px;">
<h3 style="font-size: 16px;"><span style="background-color: transparent; color: #000000;">Transportasi zat (oksigen, karbondioksida, hormon, dan sari-sari makanan).</span></h3>
</li>
<li style="font-size: 16px;">
<h3 style="font-size: 16px;"><span style="background-color: transparent; color: #000000;">Mempertahankan suhu tubuh dengan mengedarkan panas tubuh secara merata ke seluruh tubuh.</span></h3>
</li>
<li style="font-size: 16px;">
<h3 style="font-size: 16px;"><span style="background-color: transparent; color: #000000;">Pertahanan tubuh dari serangan patogen.</span></h3>
</li>
</ul>
<p style="text-align: justify;">Coba bayangin kalau di tubuh kita nggak ada darah. Malah jadi lebih serem, kan?</p>
<p style="text-align: justify;">Nah, itu dia pembahasan kita tentang proses pembekuan darah, komponen-komponen penyusun darah, serta fungsi sistem peredaran darah. Sebentarlagi, kamu akan menghadapi PAS, nih! Kalau kamu ingin mendalami materi dan memperbanyak latihan soal<em>, </em>yuk, langsung meluncur ke <a href="https://ruangguru.onelink.me/blPk/3b1dd5cf" rel="noopener" target="_blank"><span style="font-weight: bold;">ruanguji</span></a>! Dengan ribuan bank soal dan pembahasan yang menarik, dijamin persiapan kamu lebih matang! <strong> </strong></p>
<p style="text-align: center;"><a href="https://www.ruangguru.com/ruanguji" target="_blank" style="text-align: center;" class="rg-cta" rel="noopener"><img fetchpriority="high" decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/cta/4d67385e-8dfc-4cd3-8931-2ec9d1ca1c6d.jpeg" width="820" height="200" alt="IDN CTA Blog ruanguji Ruangguru" /></a></p>
<p style="text-align: left;"><strong>Referensi:</strong></p>
<p style="text-align: left;">Irnaningtyas, Istiadi Y. (2016). <em>Biologi untuk SMA/MA Kelas XI Kurikulum 2013 yang Disempurnakan Edisi Revisi</em>. Jakarta: Erlangga.</p>
<p style="text-align: left;"><strong>Sumber Gambar:</strong></p>
<p style="text-align: left;">Gambar ‘Bentuk komponen-komponen penyusun darah’ [Daring]. Tautan: https://www.britannica.com/science/blood-biochemistry (Diakses: 2 Desember 2021).</p>
<p style="font-weight: bold; text-align: left;"><em>Artikel ini telah diperbarui pada 16 November 2022.</em></p>
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<a target="_blank" rel="nofollow" href="https://play.google.com/store/apps/details?id=com.ruangguru.livestudents&hl=in">
<img src="https://cdn-web-2.ruangguru.com/static/googleplay.png" loading="lazy" alt="Button Google Play Footer " />
</a>
</li>
<li>
<a target="_blank" rel="nofollow" href="https://appgallery.huawei.com/#/app/C102352375">
<img src="https://cdn-web-2.ruangguru.com/static/huawei.png" loading="lazy" alt="Button AppGallery Footer " />
</a>
</li>
</ul>
</div>
</nav>
</div>
</div>
</div>
</div>
<div class="d-lg-none text-center">
<nav class="footer-menu social">
<p class="title">Ikuti Kami</p>
<a target="_blank" href="https://www.instagram.com/ruangguru/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/instagram.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/instagram.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/instagram.png" loading="lazy" alt="Logo Instagram Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.facebook.com/ruanggurucom/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/facebook.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/facebook.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/facebook.png" loading="lazy" alt="Logo Facebook Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://twitter.com/ruangguru/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/twitter.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/twitter.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/twitter.png" loading=" lazy" alt="Logo Twitter Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.youtube.com/ruangguru">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/youtube.png?height=60&convert=webp" type="image/webp">
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<img src="https://cdn-web-2.ruangguru.com/static/youtube.png" loading=" lazy" alt="Logo Youtube Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.linkedin.com/company/ruangguru-com">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/linkedin.png?height=60&convert=webp" type="image/webp">
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<img src="https://cdn-web-2.ruangguru.com/static/linkedin.png" loading=" lazy" alt="Logo LinkedIn Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.tiktok.com/@ruangguru">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/tiktok.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/tiktok.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/tiktok.png" loading=" lazy" alt="Logo TikTok Footer" width="32px" height="32px" />
</picture>
</a>
</nav>
</div>
<p class="footer-copyright">
© 2026 All Rights Reserved PT. Ruang Raya Indonesia
</p>
</div>
<style>
.bantuan-container {
position: relative;
}
.bantuan-element {
position: fixed;
z-index: 999;
display: flex;
align-items: flex-end;
justify-content: flex-end;
cursor: pointer;
transition: all 0.6s ease;
}
.bantuan-top {
bottom: 11rem;
right: 2rem;
}
.bantuan-bottom {
bottom: 2rem;
right: 2rem;
}
.bantuan-top-2 {
bottom: 15rem;
right: 2rem;
}
.bantuan-top-3 {
bottom: 19rem;
right: 2rem;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 2rem;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 2rem;
}
@media (min-width: 768px) {
.bantuan-element img {
width: auto;
transition: all 0.4s ease;
}
.bantuan-top img {
width: 140px;
}
.bantuan-bottom img {
width: 140px;
}
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 140px;
}
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 140px;
}
.bantuan-element.clicked {
bottom: 9rem;
right: 2.5rem;
}
.bantuan-element.clicked img {
width: auto;
height: 64px;
}
}
@media (max-width: 767px) {
.bantuan-top {
bottom: 8rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom {
bottom: 2rem;
right: 1.25rem;
align-items: center;
}
.bantuan-top-2 {
bottom: 12rem;
right: 1rem;
align-items: center;
}
.bantuan-top-3 {
bottom: 16rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 1.25rem;
align-items: center;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 1.25rem;
align-items: center;
}
.bantuan-element img {
width: auto;
}
.bantuan-top img,
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 96px;
}
.bantuan-bottom img,
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 96px;
}
}
.bantuan-element:hover {
transform: scale(1.05);
}
.bantuan-element img {
max-width: 100%;
height: auto;
}
</style>
<div id="bantuan-divs-container" style="position: relative" data-product="ruangguru" data-table="rg_floating_icon"></div>
<script>
class FloatingDivsComponent {
constructor(product = 'ruangguru', table = 'rg_floating_icon') {
this.container = document.getElementById('bantuan-divs-container');
this.floatingElements = [];
this.product = product;
this.table = table;
// Configuration
this.config = {
baseApiUrl: 'https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/rg_banner/views/',
apiKey: 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
maxElements: 2,
zIndexBase: 100,
};
// Build dynamic API URL based on table parameter
this.config.apiUrl = this.buildApiUrl();
this.init();
}
buildApiUrl() {
const baseUrl = this.config.baseApiUrl;
const tableName = this.table || 'rg_floating_icon';
const queryParams =
'offset=0&limit=99999&sort=rankPosition&where=(type,eq,floating)~and(showIn,anyof,blog)~and(hide,is,false)~and(product,eq,' +
this.product +
')&nested%5Bcta%5D%5Bfields%5D=Id,name,ctaId,imageUrl,ctaLink,targetUrl';
return `${baseUrl}${tableName}?${queryParams}`;
}
async init() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to initialize floating divs component:', error);
}
}
async fetchFloatingElements() {
try {
const options = {
method: 'GET',
headers: {
'xc-token': this.config.apiKey || 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
},
};
const urlNoco = this.config.apiUrl;
const response = await fetch(urlNoco, options);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const data = await response.json();
this.floatingElements = this.processApiResponse(data);
} catch (error) {
console.error('Error fetching floating elements:', error);
throw error;
}
}
processApiResponse(data) {
if (!data || !data.list || !Array.isArray(data.list)) {
return [];
}
console.log(data.list);
// Ensure we only get maximum 2 elements
const limitedElements = data.list.slice(0, this.config.maxElements);
return limitedElements;
}
renderFloatingElements() {
if (!this.container || this.floatingElements.length === 0) {
return;
}
// Additional safeguard: ensure we never render more than maxElements
const elementsToRender = this.floatingElements.slice(0, this.config.maxElements);
// Clean up existing elements and their event listeners
this.cleanupExistingElements();
// Clear existing content
this.container.innerHTML = '';
elementsToRender.forEach((element, index) => {
const floatingDiv = this.createFloatingDiv(element, index);
this.container.appendChild(floatingDiv);
});
}
cleanupExistingElements() {
// Clear existing elements (no need for event listener cleanup with CSS approach)
const existingElements = this.container.querySelectorAll('[data-floating-element]');
existingElements.forEach(element => {
element.remove();
});
}
createFloatingDiv(element, index) {
const div = document.createElement('div');
const cta = element.cta[0]; // Use the first CTA
// Add data attribute for cleanup tracking
div.setAttribute('data-floating-element', 'true');
// Apply CSS classes based on rankPosition
const positionClass = this.getPositionClass(element.rankPosition, index);
div.className = `bantuan-element ${positionClass}`;
div.style.zIndex = this.config.zIndexBase + index;
// Create the link and image
const link = document.createElement('a');
link.href = 'https://cta.ruangguru.com/' + cta.ctaId || '#';
link.target = '_blank';
// Add tracking attributes
link.setAttribute('data-tracking-event-type', 'landing_page__core__item_click');
link.setAttribute(
'data-tracking-context',
JSON.stringify({
product_name: this.product,
cta_action: 'redirection',
cta_action_detail: link.href,
item_type: 'floating',
item_name: element.name || 'Floating element',
item_category: 'payment',
item_position: index,
item_serial: null,
section_type: 'floating_item',
section_position: 'body',
section_name: 'floating_item',
})
);
const img = document.createElement('img');
img.src = element.imageUrl + '?h=200&convert=webp';
img.alt = element.name || 'Floating element';
img.loading = 'lazy';
// Add click tracking
link.addEventListener('click', () => {
this.trackClick(element, cta);
});
link.appendChild(img);
div.appendChild(link);
return div;
}
getPositionClass(rankPosition, index) {
// Define positioning classes based on rankPosition
if (rankPosition === 1) {
return 'bantuan-top'; // Top position
} else if (rankPosition === 2) {
return 'bantuan-bottom'; // Bottom position
} else {
// For additional elements, distribute them evenly
return `bantuan-${index % 2 === 0 ? 'top' : 'bottom'}-${Math.floor(index / 2) + 1}`;
}
}
trackClick(element, cta) {
// Implement click tracking logic here
console.log('Floating element clicked:', {
elementId: element.Id,
elementName: cta.name,
ctaId: cta.ctaId,
targetUrl: cta.targetUrl,
});
}
// Public method to manually refresh
async refresh() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to refresh floating elements:', error);
throw error;
}
}
// Public method to get current floating elements
getFloatingElements() {
return [...this.floatingElements];
}
}
// Initialize the component when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
// Get product and table parameters from data attributes
const container = document.getElementById('bantuan-divs-container');
const product = container.getAttribute('data-product') || 'ruangguru';
const table = container.getAttribute('data-table') || 'rg_floating_icon';
new FloatingDivsComponent(product, table);
});
// Export for use in other modules if needed
if (typeof module !== 'undefined' && module.exports) {
module.exports = FloatingDivsComponent;
}
</script> <div id="wp-install-nudge" style="
position: fixed;
bottom: 0rem;
right: 0;
z-index: 999;
cursor: pointer;
"></div>
<script>
(function (w, d, s, o, f, js, fjs) {
w['Sales-Nudge-Widget'] = o; w[o] = w[o] || function () { (w[o].q = w[o].q || []).push(arguments) };
js = d.createElement(s), fjs = d.getElementsByTagName(s)[0];
js.id = o; js.src = f; js.async = 1; fjs.parentNode.insertBefore(js, fjs);
}(window, document, 'script', 'wpInstallNudge', 'https://cdn-web-2.ruangguru.com/sales-nudge/6198a95130/dist/widget.js'));
wpInstallNudge('init', { targetElementId: 'wp-install-nudge', clientTarget: 'ruangguru_blog' });
</script>
<script>
// note: disabled due to auto reload page
// var lastScrollTop = 0;
// $(window).scroll(function(event){
// var st = $(this).scrollTop();
// if (st > lastScrollTop){
// $('#wp-install-nudge').slideDown( "slow", function() {});
// } else {
// $('#wp-install-nudge').slideUp( "slow", function() {});
// }
// lastScrollTop = st;
// });
// $(document).ready(function () {
// $("#wp-install-nudge").hide();
// });
$('#wp-install-nudge').click(function(){
Analytics.track("promotion__install_nudge__click",
{
user_email: "ruangguru@blog.com",
cta_link: widgetData.dataConfig.target_link
}).catch((err) => {
console.log("tracker error", err);
});
});
</script>
</footer>
<div id="__next"></div>
<script type="speculationrules">
{"prefetch":[{"source":"document","where":{"and":[{"href_matches":"\/blog\/*"},{"not":{"href_matches":["\/blog\/wp-*.php","\/blog\/wp-admin\/*","\/blog\/wp-content\/uploads\/*","\/blog\/wp-content\/*","\/blog\/wp-content\/plugins\/*","\/blog\/wp-content\/themes\/ruangguru\/*","\/blog\/*\\?(.+)"]}},{"not":{"selector_matches":"a[rel~=\"nofollow\"]"}},{"not":{"selector_matches":".no-prefetch, .no-prefetch a"}}]},"eagerness":"conservative"}]}
</script>
<script>
async function getCtaDetails(ctaIds) {
const endpoint =
" https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/CTA/views/CTA?offset=0&limit=10&where=(ctaId,in," + ctaIds.toString() + ")";
try {
const response = await fetch(endpoint, {
headers: {
"xc-token": "-hG2nBDJzSj0agSgNtcJx97M4F02y54nUMoY6plJ",
},
});
const data = await response.json();
const ctaList = data?.list || [];
const ctaMap = new Map();
for (const ctaData of ctaList) {
ctaMap.set(ctaData.ctaId, ctaData);
}
return ctaMap;
} catch (error) {
console.error("Error fetching CTA details:", error);
return new Map();
}
}
async function replaceCTA() {
const regex = /{{cta\((‘(.*?)’|“(.*?)”)\)}}/g;
const bodyHTML = document.body.innerHTML;
const matches = Array.from(bodyHTML.matchAll(regex));
const ctaIds = matches.map((match) => {
let ctaId = match[2] ?? match[3];
return ctaId;
});
const ctaMap = await getCtaDetails(ctaIds);
const replacedHTML = bodyHTML.replace(regex, (match, _inner, ctaId1, ctaId2) => {
const ctaId = ctaId1 ?? ctaId2;
const ctaData = ctaMap.get(ctaId);
if (ctaData) {
return `<a href="https://cta.ruangguru.com/${ctaData.ctaId}" target="_${ctaData.targetType}" style="position:relative;display:inline-block;">
<img src="${ctaData.imageUrl}" loading="lazy" alt="${ctaData.altText}" />
</a>`;
} else {
return match;
}
});
document.body.innerHTML = replacedHTML;
}
</script>
<meta name="author" content="Ruangguru Tech Team">
<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-PVNLZFT" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- Tracker -->
<script type="text/javascript" src="https://cdn-web-2.ruangguru.com/landing-page-web/public/staticpages/global-assets/js/cta.js"></script>
<script src="https://unpkg.com/@dotlottie/player-component@latest/dist/dotlottie-player.mjs" type="module"></script>
</body>
</html>