The narrowest blood vessels are called:

Name: The narrowest blood vessels are called:
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Capillaries are the narrowest blood vessels, with a diameter only slightly wider than that of a red blood cell. They are responsible for the exchange of oxygen, nutrients, and waste products between the blood and tissues. Arterioles and venules are larger vessels that connect arteries and veins, respectively. Veins are also larger vessels that carry blood back to the heart.

The Narrowest Blood Vessels Are Called