迷走神经对心脏的作用是( )

lk2024-09-20  22

题目:迷走神经对心脏的作用是( )

A. 心率减慢,心肌收缩力增强

B. 心率减慢,心肌收缩力降低

C. 心率加快,心肌收缩力增强

D. 心率加快,心肌收缩力降低

E. 心率不变,心肌收缩力不变

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