Final answer:
Capillaries are the blood vessels that surround tissues and cells, allowing for the exchange of nutrients and waste.
Explanation:
Capillaries are the blood vessels that surround tissues and cells. They have a single layer of cells where exchange of nutrients, waste, and oxygen takes place. In contrast, arteries carry blood away from the heart, and veins bring blood back to the heart.
Learn more about blood vessels here:
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