The villi of the small intestine contain many capillaries. Why are the capillaries so important? What is the name of the process of in which nutrients move across the surface cells of the villi into the blood?
Capillaries take the oxygen from the alveoli into the blood stream.This is why they are important.
Nutrients do not go from the alveoli into the blood stream it is the oxygen that does.The process is simple diffusion.