推荐回答（4个）
先是中文的解释~二尖瓣如同一个“单向活门”，保证血液循环由左心房一定向左心室方向流动和通过一定流量。心脏当左心室收缩时，挤压室内血液，血液冲击瓣膜。二尖瓣关闭，血液不倒入左心房。三尖瓣如同一个“单向活门”，保证血液循环由右心房一定向右心室方向流动和通过一定流量。心脏当右心室收缩时，挤压室内血液，血液冲击瓣膜。三尖瓣关闭，血液不倒入右心房。然后是英文的解释~
The mitral valve（二尖瓣） (also known as the bicuspid valve or left atrioventricular valve) is a dual-flap valve in the heart that lies between the left atrium (LA) and the left ventricle (LV). The mitral valve（二尖瓣） and the tricuspid valve（三尖瓣） are known collectively as the atrioventricular valves because they lie between the atria and the ventricles of the heart and control the flow of blood.The tricuspid valve is on the right dorsal side of the mammalian heart, between the right atrium and the right ventricle.
二尖瓣，左心室联通左心房出的位置···三尖瓣，右心房跟右心室联通的位置·····，看书呀！课本有。考试还会考，全身血液循环的路径，肺循环路径等~·5到8分
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