In which of these blood vessels do the exchange of gases and other materials occur?

Question

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Capillaries are the smallest blood vessels in the body and have walls thin enough to allow for the exchange of gases and nutrients between the blood and surrounding tissues. Arteries carry oxygenated blood away from the heart, veins carry deoxygenated blood towards the heart, and the right atrium is a chamber of the heart that receives deoxygenated blood from the body.

In Which of These Blood Vessels Do the Exchange of Gases