All gas exchange between the vascular system and tissues occurs in…arterioles. veins. capillaries. venules.
capillaries.
All gas exchange between the vascular system and tissues occurs in the capillaries. Capillaries are the smallest blood vessels in the body, and they have very thin walls which allow for the exchange of gases, nutrients, and waste products between the blood and the surrounding tissues. Arterioles and venules are slightly larger blood vessels which transport blood to and from the capillaries, while veins return blood back to the heart. However, these larger blood vessels do not play a direct role in gas exchange between the vascular system and tissues.
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