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The answer to this question is:- The veins - these carry deoxygenated blood back to the heart. Veins possess valves which are internal structures that prevent the backflow of deoxygenated blood, and permit the blood to flow only in one direction.

Sorry... that answer was for your previous question.

The arteries - Arteries carry blood AWAY from the heart, as a result the blood pulses through the arteries in response to the heart's beat. The radial artery on the inside of the wrist is often used in measuring pulse by counting the number of heartbeats in one minute. Any further help required please feel free to contact me :-)

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