呼吸系统
呼吸系统（英语：respiratory system）指生物体内拿呼吸气吸入体内并进行气体交换个系统。拉人类搭其他哺乳动物体内中，呼吸系统包括呼吸道、肺搭呼吸肌。氧气搭二氧化碳拉呼吸系统里通过扩散作用拉外环境搭血液中进行被动交换，气体交换过程发生拉肺腔内。
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