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肺循环起始于什么
更新时间: 2021-05-14 03:27:41  

1、肺循环起始于右心室。

2、肺循环是指血液由右心室流入肺动脉,流经肺部的毛细血管网,再由肺静脉流回左心房的循环;即肺循环起始于右心室,终止于左心室。肺循环途径比体循环短,肺动脉管壁薄,弹性纤维较少,易于扩张;肺血管分支多而短,口径粗,外周阻力小,肺动脉压只有主动脉压的1/6。肺毛细血管的血压也很低,约0.93千帕。

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