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主动脉瓣位于()。

单选题
2021-12-28 10:35
A、左房室口周围
B、右房室口周围
C、右心室流出道口周围
D、左心室流出道口周围
E、右心房的最下部,卵圆窝的右下方
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正确答案
D

试题解析
右心房通过三尖瓣和右心室相连,当心室收缩时,瓣膜合拢封闭房室口以防止血液向心房内逆流。在肺动脉口的周缘附有三片半月形的肺动脉瓣,当心室舒张时,防止肺动脉的血液反流至右心室。在左房室口处有二尖瓣,主动脉口的周缘附有三片半月形的主动脉瓣。二尖瓣和主动脉瓣的形状、结构及作用与三尖瓣和肺动脉瓣的基本一致。

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