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See all questions in Circulatory System. Impact of this question views around the world. You can reuse this answer Creative Commons License. The arteries deliver the oxygen-rich blood to the capillaries, where the actual exchange of oxygen and carbon dioxide occurs.
The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart. Veins carry the blood back to the heart.
Unlike arteries, veins contain valves that ensure blood flows in only one direction. Valves also help blood travel back to the heart against the force of gravity. Join Our Email List. Learn more about our commitment to safety. The Franklin Institute is a C 3 nonprofit registered in the U.
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