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22.7: 心脏循环
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JoVE Core
Biology

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心脏循环
 
此画外音是计算机生成的
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* 此文字翻译是计算机生成的

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(收缩)和放松(舒张)的快速协调。

过程

从右心房壁窦房结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AV节点时,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Purkinje纤维传导信号,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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