血液与人体其他组织之间的气体交换是另一种呼吸，叫做内呼吸，或组织呼吸。
The exchange of gases between the blood and other tissues in the body is another form of respiration, called internal respiration, or tissue respiration.
病毒主要侵犯人类呼吸道，一方面在呼吸道上皮细胞和血管内皮细胞内复制，损伤肺组织，破坏气体交换屏障；
Virus mainly affects the human respiratory tract. It can replicate in airway epithelial cells and endothelial cells, damage lung tissue, and destroy gas exchange barrier.
结论缺氧可引起大鼠肺组织面积密度增加，肺泡有效气体交换面积减少。
Conclusions Hypoxia can induce increase in pulmonary tissue area density and decrease in aerial exchange area in alveoli.
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