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Multiple Choice

Which vessel type connects arteries and veins at the tissue level?

Capillaries form the bridge between arteries and veins at the tissue level. Their walls are extremely thin, often just a single endothelial cell layer, which makes it possible for gases, nutrients, and waste to diffuse between the blood and surrounding tissues. Blood travels from larger arteries into smaller arterioles, then into capillary networks where exchange occurs, and finally into venules and veins that return blood to the heart. While arteries carry blood away from the heart under higher pressure and veins bring it back, they don’t connect directly in the tissues—the capillary network provides that essential link for tissue-level exchange. Lymphatics drain excess interstitial fluid and are a separate system from the blood vessels.

Capillaries form the bridge between arteries and veins at the tissue level. Their walls are extremely thin, often just a single endothelial cell layer, which makes it possible for gases, nutrients, and waste to diffuse between the blood and surrounding tissues. Blood travels from larger arteries into smaller arterioles, then into capillary networks where exchange occurs, and finally into venules and veins that return blood to the heart. While arteries carry blood away from the heart under higher pressure and veins bring it back, they don’t connect directly in the tissues—the capillary network provides that essential link for tissue-level exchange. Lymphatics drain excess interstitial fluid and are a separate system from the blood vessels.