Question

multiple choice question
which has the thickest wall?
capillary
vein
artery
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Explanation:

Arteries carry blood away from the heart under high pressure, so they need thicker walls (with more smooth muscle and elastic tissue) to withstand that pressure. Veins have thinner walls as they carry blood at lower pressure, and capillaries have extremely thin walls for gas and nutrient exchange.

Answer:

C. Artery