呼出(exhalation、expiration)是指动物进行呼吸时,空气或其他物质经由气管离开肺泡的运动。主要是由横膈膜的收缩与舒张来控制。

当呼出空气时,横隔膜会呈拱形里的空气体积会减少,气压则会增加。

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