What type of tissue is present on alveolar exchange surfaces? What are the names of two cell types that comprise the exchange surfaces?

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Multiple Choice

What type of tissue is present on alveolar exchange surfaces? What are the names of two cell types that comprise the exchange surfaces?

Alveolar exchange surfaces are lined by simple squamous epithelium. This very thin tissue minimizes diffusion distance for oxygen and carbon dioxide between the air in the alveolus and the blood in nearby capillaries, enabling efficient gas exchange. The surface is formed by two pneumocyte types: Type I pneumocytes, which are flat and cover most of the alveolar surface to form the main gas-exchange barrier; and Type II pneumocytes, which are more cuboidal and produce surfactant to reduce surface tension and prevent collapse, also capable of proliferating to repair the surface if needed. Together with the capillary endothelium and fused basement membranes, this creates the delicate respiratory membrane essential for diffusion.

Alveolar exchange surfaces are lined by simple squamous epithelium. This very thin tissue minimizes diffusion distance for oxygen and carbon dioxide between the air in the alveolus and the blood in nearby capillaries, enabling efficient gas exchange. The surface is formed by two pneumocyte types: Type I pneumocytes, which are flat and cover most of the alveolar surface to form the main gas-exchange barrier; and Type II pneumocytes, which are more cuboidal and produce surfactant to reduce surface tension and prevent collapse, also capable of proliferating to repair the surface if needed. Together with the capillary endothelium and fused basement membranes, this creates the delicate respiratory membrane essential for diffusion.

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