人在吸气时,膈肌和肋间外肌的生理活动是(    ) A、膈肌收缩

人在吸气时,膈肌和肋间外肌的生理活动是(   

A、膈肌收缩,肋间外肌舒张      B、膈肌舒张,肋间外肌收缩

C、膈肌舒张,肋间外肌舒张      D、膈肌收缩,肋间外肌收缩

答案

D

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