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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心脏有节奏的跳动, 这个序列叫做心动周期, 收缩,即心脏收缩 与舒张,即心脏舒张的快速协作。
电信号从窦房结发出, 位于右心房壁附近,将因此两个心房 同时收缩,并将血液 推入心室。
当脉搏到达 位于右心房和右心室之间的房室结, 它就会暂停大约1/10秒, 允许血液彻底从心房中清空。
然后电荷遍布希氏束, 通过左右束枝 从心室间隔向下, 然后通过心室壁的 浦肯野氏纤维, 诱发心室收缩 将血液从心脏泵出 传送到肺动脉和主动脉。
在心肌放松之后, 心房充满血液,循环再次重复。
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。
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。
Troiani, Diana, and Ermanno Manni. "The Work by Giulio Ceradini in Explaining the Mechanism of Semilunar Cardiac Valve Function." Advances in Physiology Education 35, no. 2 (June 1, 2011): 110–13. [Source]
Ho, Ivan Shun. "Visualizing the Cardiac Cycle: A Useful Tool to Promote Student Understanding." Journal of Microbiology & Biology Education: JMBE 12, no. 1 (May 19, 2011): 56–58. [Source]
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