肺 还具有代谢和防御等非呼吸功能（non-respiratory function）。许多病理性因素可导致肺 的上述功能发生改变，从而导致肺部疾病和生命活动的异常。
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本文概述了肺的部分非呼吸性生理功能，指出肺具有自我防御和保护的作用。
This paper deals with some physiological function except breath, points out that lungs also have self-defensible and protective function.
其机制主要是呼吸中枢的功能降低，肺和胸廓的弹性阻力、呼吸道的非弹性阻力增加所致。
The falling function of the respiratory centre, the elastic resistance of the lungs and thoracic cage, and the non-elastic resistance in the respiratory tract are responsible for the decline.
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