在“测量胸围差”的实验时，要求你尽力深吸气再尽力深呼气。那么在吸气过程中你的肋骨和膈的运动方式是()。
- A.肋骨上升，膈舒张而上升
- B.肋骨上升，膈收缩而下降
- C.肋骨下降，膈舒张而上升
- D.肋骨下降，膈收缩而下降
正确答案及解析
正确答案
解析
呼吸运动是指人体胸廓有节律地扩大和缩小的运动，包括吸气过程和呼气过程。吸气时，肋间肌收缩．肋骨向上向外运动，使胸廓的前后径和左右径都增大，同时膈肌收缩，膈顶部下降，胸廓的上下径增大，这样胸廓的容积就增大，肺也随着扩张，肺内的气压低于外界大气压，外界空气通过呼吸道进入肺，完成吸气的过程。呼气则刚好相反。
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