人体吸气时呼吸肌收缩,胸廓向上向外移动,如尽力吸气膈肌还会收

人体吸气时呼吸肌收缩,胸廓向上向外移动,如尽力吸气膈肌还会收缩,使膈顶下降,结果(   

A、肺内气压减小,外界气体入肺             B、肺内气压增大,外界气体入肺

C、肺内气压减小,外界气体出肺             D、肺内气压增大,外界气体出肺

答案

A

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