咳嗽
咳嗽是一种呼吸道常见个突发性症状，咳嗽由气管、支气管粘膜或胸膜受炎症、异物、物理或化学性刺激引起，咳嗽时先是声门关闭，呼吸肌收缩，肺内压升高，然后声门张开，肺内空气喷射而出。通常伴随着声音。咳嗽具有清除呼吸道异物搭分泌物个保护性作用。
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