Why do capillaries need to be thin walled?
A .so only a few nutrients can pass through
B. so only a small amount of blood can flow through
C. so they can go through the small spaces within the body
D. so the exchange of gases and nutrients can happen

Capillaries are the places where the exchange of substances between the blood and adjacent tissues takes place. Substance exchange can occur both between the cells that form the vessel wall and across it. Pores present in some types of blood capillaries also act as transfer sites.

In this case, capillaries are extremely important for gas and nutrient exchange.

See more about capillaries at brainly.com/question/14053121

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Why do capillaries need to be thin walled? A .so only a few nutrients can pass through B. so only a small amount of blood can flow through C. so they can go through the small spaces within the body D. so the exchange of gases and nutrients can happen

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What are capillaries?

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Why do capillaries need to be thin walled?
A .so only a few nutrients can pass through
B. so only a small amount of blood can flow through
C. so they can go through the small spaces within the body
D. so the exchange of gases and nutrients can happen