Exchange of oxygen, nutrients, and waste materials takes place across the walls of small vessels called ____.

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Capillaries are the smallest and thinnest blood vessels where the exchange of oxygen, nutrients, and waste materials takes place across their walls. Ducts carry fluids such as bile and pancreatic juice. Venules are small veins that join with larger veins. Arterioles are small arteries that lead to capillary beds. Lymphatics are vessels that carry lymph, a fluid that is similar to plasma but contains white blood cells and is filtered through lymph nodes.

Exchange of Oxygen, Nutrients, and Waste Materials Takes Place Across