Question

In lungs, the air is separated from the venous blood through

Answer 1

Answer:

Alveoli are the primary sites of exchange of gases. Exchange of gases also occurs between blood and tissues. Oxygen and carbon dioxide are exchanged in these sites by simple diffusion mainly based on pressure/ concentration gradient. Solubility of the gases as well as the thickness of the membranes involved in diffusion are also some important factors that can affect the rate of diffusion. The diffusion membrane is made up of three major layers namely, the thin squamous epithelium of alveoli, the endothelial of alveolar capillaries and the basement substance in between them. However, its total thickness is much less than a millimetre.

Explanation:

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Answer 2

Answer:

There are 2 layers separating the air from the blood in the lungs. One is the sqamous layer of epithelium of the alveolar walls of the lungs and the other is the endothelium lining (innermost) of the blood vessel.

Explanation: