The majority of exchange of gases and nutrients between blood and tissue takes place at the __ level.

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Capillary beds are specialized structures where exchange of gases, nutrients, and waste products occurs between the blood circulating through the capillaries and the surrounding tissues. Capillary beds have thin walls that allow for efficient diffusion of molecules, and their large surface area ensures that a significant amount of exchange can take place. Small elastic arteries, small muscular arterioles, and venules may play a role in regulating blood flow to and from the capillary bed, but they are not the primary site of gas and nutrient exchange.

The Majority of Exchange of Gases and Nutrients Between Blood