________ are the only blood vessels whose walls are thin enough to permit blood-tissue exchange.

Name: ________ are the only blood vessels whose walls are thin enough to permit blood-tissue exchange.
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Capillaries are comprised of a single layer of endothelial cells with very thin walls, allowing for the exchange of nutrients, gases, and waste products between the blood and surrounding tissues. Arteries and veins have thicker walls, while arterioles and venules are intermediate in size and structure.

________ Are the Only Blood Vessels Whose Walls Are Thin