Question

Why do capillaries need to be thin walled?

so only a few nutrients can pass through
so only a small amount of blood can flow through
so they can go through the small spaces within the body
so the exchange of gases and nutrients can happen

Answer 1

Answer: so the exchange of gases and nutrients can happen

Answer 2

so the exchange of gases and nutrients can happen

Step-by-step explanation:

so the exchange of gases and nutrients can happen

thin walls = less distance for gases and nutrients to travel