When surgeons harvest a vein to reattach a broken artery, do they need to be con

Question

When surgeons harvest a vein to reattach a broken artery, do they need to be concerned about the presence of valves?

a. No. Neither arteries nor veins have valves.

b. Yes. Veins (but not arteries) have valves. They need to make sure that any valve in the piece of vein used is oriented to allow blood in the artery to flow toward the heart.

c. Yes. Veins (but not arteries) have valves. They need to make sure that any valve in the piece of vein used is oriented to allow blood in the artery to flow away from the heart.

d. Yes. Both arteries and veins contain valves, so they need to make sure that any valve in the piece of vein used is oriented in the same direction as the valves in the artery.

Explanation / Answer

Answer is c. Yes. Veins (but not arteries) have valves. They need to make sure that any valve in the piece of vein used is oriented to allow blood in the artery to flow away from the heart.

Only Veins have valves which stop the blood from flowing backward. Compared to the arteries, pressure in the veins is very low. The blood is being pushed through the arteries as the heart squeezes the blood out. So valves in vain should be oriented to allow blood to flow away from heart

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