心动周期的特点是A.持续时间与心率无关B.收缩期大于舒张期C.舒张期大于收缩期D.房室舒张时间相同E.房室收缩时间相同

作者: rantiku 人气: - 评论: 0
问题 心动周期的特点是
选项 A.持续时间与心率无关 B.收缩期大于舒张期 C.舒张期大于收缩期 D.房室舒张时间相同 E.房室收缩时间相同
答案 C
解析 :每个心动周期持续0.8s。一个心动周期中,两心房首先收缩,持续0.1s,继而心房舒张,持续0.7s。当心房收缩时,心室处于舒张期,心房进入舒张期后不久,心室开始收缩,持续0.3s,随后进入舒张期,占时0.5s。

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