Which blood vessels have the thinnest walls, consisting of a single endothelial layer, enabling nutrient and gas exchange with tissues?
Answer and explanation
Correct answer: A. capillaries
- Step 1: Capillaries have walls just one cell thick (endothelium) across which diffusion of gases, nutrients, and waste takes place. Answer: capillaries. Why not the others: Arteries and veins have thick muscular and adventitial layers.
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