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通气的分布肺换气是指肺泡与血液间进行气体交换的过程。气体吸入肺内的分布实际上不是十分均匀的,每分钟通气量中右肺占54%,左肺占46%。更重要的是,由于脏器重力造成区域性胸内负压差,肺的下垂部分胸内负压相对地小,当肺内压恒定时该区透壁压力梯度相对地大,因而顺应性亦大,所以肺下垂部分的通气常大于其顶部,人体在直立位吸气时情况就是如此。再则,从气管到肺泡,气体在气道各部遇到的阻力存在着差异,这也是正常通气不均的成因,所以
Ventilation of the lungs Ventilation refers to the process of gas exchange between the alveoli and the blood. The distribution of gas into the lungs is actually not very uniform, 54% of the right lungs per minute ventilation, and 46% of the left lungs. More importantly, due to organ regional gravity caused by negative pressure within the thorax, pneumothorax part of the thorax negative pressure is relatively small, when the lung pressure is constant when the transmural pressure gradient is relatively large, so the compliance is also Large, so part of the lung patency ventilation is often greater than its top, the human body in the upright position when inhaling is the case. Furthermore, there is a difference in the resistance encountered by the gas in various parts of the airway from the trachea to the alveoli, which is why the normal ventilation is not uniform