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What is the difference between an artery and a vein? An artery carries blood away from the heart; a vein carries blood to the heart. An artery is responsible for carrying blood; a vein is responsible for gas exchange. An artery is responsible for gas exchange; a vein is responsible for carrying blood. An artery carries blood to the heart; a vein carries blood away from the heart.

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An artery carries blood away from the heart; a vein carries blood to the heart. Just remember... Artery away
User Rob Kennedy
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A) An artery carries blood away from the heart; a vein carries blood to the heart.
Actually neither arteries nor veins are responsible for gas exchange, only the tiniest thin-walled vessels do- they are called capillaries.
User Perdixo
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