Question

what blood vessels help with gas exchange?
veins
arteries
capillaries
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Explanation:

Gas exchange (e.g., oxygen and carbon dioxide) requires thin blood vessel walls for diffusion. Capillaries have walls only one cell thick, enabling this process. Veins carry deoxygenated blood, and arteries carry oxygenated blood, but neither is structured for direct gas exchange.

Answer:

capillaries