呼出(exhalation、expiration)是指動物進行呼吸時,空氣或其他物質經由氣管離開肺泡的運動。主要是由橫膈膜的收縮與舒張來控制。

當呼出空氣時,橫隔膜會呈拱形里的空氣體積會減少,氣壓則會增加。

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