问题
选择题
人们能够发音是因为呼气时，从肺部呼出的气流震动了（ ）
A．鼻
B．咽
C．支气管
D．声带
答案
当膈肌和肋间外肌舒张时，肋骨与胸骨因本身重力及弹性而回位，膈顶部上升，结果胸廓缩小，肺也随之回缩，形成被动的呼气运动．可见，呼气时膈肌舒张、肋骨间的肌肉舒张，肺缩小、胸廓缩小．从肺部呼出的气流震动了声带．
故选D
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人们能够发音是因为呼气时，从肺部呼出的气流震动了（ ）
A．鼻
B．咽
C．支气管
D．声带
当膈肌和肋间外肌舒张时，肋骨与胸骨因本身重力及弹性而回位，膈顶部上升，结果胸廓缩小，肺也随之回缩，形成被动的呼气运动．可见，呼气时膈肌舒张、肋骨间的肌肉舒张，肺缩小、胸廓缩小．从肺部呼出的气流震动了声带．
故选D
| 交际运用。 | |
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