![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
当心率增快时,心动周期持续时间缩短,表现为()
A.心室的收缩期和舒张期均按比例缩短
B.心室的收缩期和舒张期均缩短,但收缩期缩短的比例较大
C.心室的收缩期和舒张期均缩短,但舒张期缩短的比例较大
D.心室的收缩期缩短,而心室的舒张期不缩短
E.心室的收缩期不缩短,而心室的舒张期缩短
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
C、心室的收缩期和舒张期均缩短,但舒张期缩短的比例较大
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.心室的收缩期和舒张期均按比例缩短
B.心室的收缩期和舒张期均缩短,但收缩期缩短的比例较大
C.心室的收缩期和舒张期均缩短,但舒张期缩短的比例较大
D.心室的收缩期缩短,而心室的舒张期不缩短
E.心室的收缩期不缩短,而心室的舒张期缩短
C、心室的收缩期和舒张期均缩短,但舒张期缩短的比例较大