Waiting
Login processing...

Trial ends in Request Full Access Tell Your Colleague About Jove

22.7: 心脏循环
目录

JoVE Core
Biology

A subscription to JoVE is required to view this content.

Education
The Cardiac Cycle
 
文字本

22.7: 心脏循环

心脏在一个叫做心动周期的序列中有节奏地跳动 - 收缩(缩紧)和放松(舒张)的快速协调。

过程

从右心房壁窦房结(SA)到右心房和右心室之间的房室结的电信号会导致两个心房同时收缩。当信号到达房室结(AV)时,它暂停约第十秒,允许心房收缩并将血液排入心室,然后收缩。

电脉冲由房室束传导到左右束支。然后,心室壁上的浦肯野纤维(Purkinje fiber)传导信号,诱导心室收缩并将血液泵出心脏。

在舒张(放松)过程中,心脏充满血液,循环重复。


建议阅读

Tags

Cardiac Cycle Contraction Systole Relaxation Diastole Sinoatrial Node Atria Ventricles Atrioventricular Node Blood Flow Bundle Of His Bundle Branches Purkinje Fibers Ventricular Contraction Pulmonary Artery Aorta Heart Muscle Relaxation Electrical Signals

Get cutting-edge science videos from JoVE sent straight to your inbox every month.

Waiting X
Simple Hit Counter