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22.7: 心脏循环
目录

JoVE Core
Biology

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Education
The Cardiac Cycle
 
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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。


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