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什么是呼吸的功能? 生命活动不断地进行,必须不断地进行新陈代谢,消耗氧气,同时产生二氧化碳。呼吸的功能就是供应组织细胞以氧气,并将二氧化碳排出体外。组织细胞从血液中摄取氧,将二氧化碳转移至血液的过程称内呼吸。通过肺从外界环境吸入新鲜空气增加血氧含量,并呼出血中多余的二氧化碳的过程称为外呼吸。由于正常的呼吸功能,使血液中氧与二氧化碳的分压维持相对恒定,动脉血氧分压为80～100毫米汞柱,二氧化碳分压为30～40毫米汞柱。混合静脉血的氧分压约为40毫米汞柱,二氧化碳分压约为46毫米汞柱。
What is the function of breathing? Life activities continue to be carried out, we must continue to carry out metabolism, oxygen consumption, while generating carbon dioxide. The function of breathing is to supply tissue cells with oxygen and expel the carbon dioxide out of the body. Tissue cells take oxygen from the bloodstream and transfer carbon dioxide into the bloodstream called endocytosis. Through the lungs from the outside world to inhale fresh air to increase blood oxygen content, and exhale blood excess carbon dioxide process known as the external breathing. Due to normal respiratory function, the partial pressure of oxygen and carbon dioxide in blood is kept relatively constant. The partial pressure of arterial oxygen is 80-100 mmHg and the partial pressure of carbon dioxide is 30-40 mmHg. Mixed venous oxygen partial pressure of about 40 mm Hg, carbon dioxide partial pressure of about 46 mm Hg.