Question

The respiratory membrane across which gases diffuse is very thin and is made up of?

Answer 1

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Oxygen and carbon dioxide move across what we call the respiratory surface, and that consists of an alveolar epithelial cell and a pulmonary capillary endothelial cell. Now, this respiratory surface is also referred to as the respiratory membrane. Note that the air is on one side of the membrane and blood is on the other side of the membrane. As you can see from the image above, oxygen moves out of the alveolar air into the blood, while carbon dioxide moves in the opposite direction. Therefore, we use the term gas exchange, as oxygen is exchanged for carbon dioxide across the respiratory surface.

Explanation:

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Answer 2

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=> The membrane across which gas exchange takes place in the alveoli (i.e. the blood-air barrier) is extremely thin (in humans, on average, 2.2 μm thick). It consists of the alveolar epithelial cells, their basement membranes and the endothelial cells of the pulmonary capillaries.