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心室内压最大幅度降低是在()

单选题
2021-12-30 23:19
A、等容收缩期
B、快速射血期
C、减慢射斑期
D、等容舒张期
E、快速充盈期
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正确答案
D

试题解析
房室瓣关闭到主动脉瓣开启前的这段时期,心室的收缩不能改变心室的容积,故称等容收缩期,由于此时心室继续收缩,因而室内压急剧升高;从半月瓣关闭至房室瓣开启前的这一段时间内,心室舒张而心室容积并不改变,故称为等容舒张期,由于此时心室继续舒张,因而室内压急剧下降。

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