单选题:在等容舒张期,心脏各瓣膜的功能状态是(  )

题目内容:
在等容舒张期,心脏各瓣膜的功能状态是(  ) A.房室瓣关闭,动脉瓣开放
B.房室瓣开放,动脉瓣关闭
C.房室瓣关闭,动脉瓣关闭
D.房室瓣开放,动脉瓣开放
E.二尖瓣关闭.三尖瓣开放
参考答案:
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