Serambi jantung

Atrium
Gambar bagian depan jantung menunjukkan serambi
Rincian
Bagian dari	Jantung
Sistem	Sistem peredaran darah
Pengidentifikasi
Bahasa Latin	Atrium
MeSH	D006325
TA98	A12.1.00.017
TA2	4022, 4054
FMA	7099 85574, 7099
*Daftar istilah anatomi* [sunting di Wikidata]

Serambi jantung atau atrium adalah ruang jantung bagian atas di mana darah masuk ke dalam jantung.^[1] Ada dua serambi dalam jantung – serambi kiri berhubungan dengan paru paru, dan serambi kanan yang berhubungan dengan sistem sirkulasi darah dari pembuluh balik. Serambi jantung menerima darah, ketika otot jantung berkontraksi, otot jantung memompa darah ke bilik jantung. Semua binatang dengan sistem sirkulasi darah tertutup mempunyai pasti setidaknya satu serambi (manusia mempunyai dua serambi).

Simpul

Simpul sinoatrial^[2] (SA) terletak di aspek belakang di serambi kanan, medial terhadap muara vena kava superior. Sel simpul sinoatrial adalah sekelompok sel alat pacu jantung yang secara spontan mendepolarisasi untuk menciptakan aksi potensial. Aksi potensial jantung kemudian menyebar ke dua serambi yang menyebabkan kontraksi, mendorong darah supaya mengalir ke dalam bilik.

Simpul atrioventrikular^[3] (AV) adalah simpul lain yang terlibat dalam sistem konduksi listrik jantung. Simpul ini terletak di antara serambi dan bilik.

Fungsi

Serambi kanan menerima darah masuk ke jantung dari seluruh tubuh melalui vena kava superior dan inferior. Vena kava superior mengembalikan darah tanpa oksigen dari bagian kepala, leher dan dada ke ser kanan. vena kava inferior mengembalikan darah tanpa oksigen dari tubuh bagian bawah (kaki, punggung, perut, dan panggul) ke serambi kanan.

Serambi kiri menerima darah masuk ke jantung dari vena pulmonalis. Vena pulmonalis menghubungkan serambi kanan dengan paru-paru dan membawa darah mengandung oksigen ke jantung.

Rujukan

^ Parker, Sybil, P (1984). McGraw-Hill Dictionary of Biology. McGraw-Hill Company.
^ "ScienceDirect". www.sciencedirect.com. Diakses tanggal 2019-04-19.
^ "ScienceDirect". www.sciencedirect.com. Diakses tanggal 2019-04-19.

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