The site for exchange nutrients and waste in capillaries.
Exchange of Gases, Nutrients, and Waste Between Blood and Tissue by diffusion Occurs in the Capillaries. Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange of certain elements between your blood and tissues.
Plasma and interstitial fluid are very similar because water, ions, and small solutes are continuously exchanged between them across the walls of capillaries, through pores and capillary clefts.
Capillary walls contain small pores that allow certain substances to pass into and out of the blood vessel.
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