Why are valves present in veins but not in arteries?

Question

Lucas Aguilar · Accepted Answer

Aside from preventing back flow of blood, valves in the veins aid in the return of blood from the extremities to the heart ( from feet and legs in particular).

Your heart is a strong muscle that can pump blood in spurts to all regions of your body right down to every capillary. The more difficult part is getting it back.

Rather than elastic arteries that carry away blood quickly and efficiently on the outbound route, we now have tiny capillaries that need to be cleared into increasingly larger veins to return the blood for cleaning in the liver and re-oxidizing in the lungs before the next departure.

Moreover, blood flows under high pressure in artery (BP is measured as pressure of blood exerted on wall of artery) but in veins the blood pressure is less than 10mm of Hg. To allow flow of blood back to heart, lumen inside vein is larger in diameter and to prevent backflow, series of valves are there.

Your veins have one-way valves in them to keep the blood moving, and in the right direction . You can help in this procedure simply by making movements. Try to avoid staying in one place or position for too long.

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Autumn Anderson · Answer

The primary purpose of vein valves is to stop blood from flowing backward.

There is no need for artery valves to stop back flow because the pressure on the blood in the arteries after it is pumped by the heart is substantially higher than that of the blood in veins.

Since blood in veins is returning to the heart from different organs and tissues under much lower pressure, backflow could occur if there are no valves to stop it.

Josiah Austin · Answer

undefined Valves in veins prevent backflow of blood, aiding against gravity. Arteries rely on smooth muscle contractions for blood propulsion.