心率超过180次/分时,每分输出量减少的原因是A:快速充盈期缩短B:减慢充盈期缩短C:等容收缩期缩短D:减慢射血期缩短E:快速射血期缩短

作者: rantiku 人气: - 评论: 0
问题 心率超过180次/分时,每分输出量减少的原因是
选项 A:快速充盈期缩短 B:减慢充盈期缩短 C:等容收缩期缩短 D:减慢射血期缩短 E:快速射血期缩短
答案 A
解析 回心血量绝大部分是在快速充盈期进入心室的,心率超过180次/分时,由于快速充盈期缩短每分输出量减少。

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