Why don't arteries have valves?

Answer 1

The blood pressure and flow rate in veins is low. When the blood in them is moving upwards (e.g. in the legs) it can stagnate and may have a tendency to flow backwards in the vein. The valves prevent this back flow by closing.

The blood pressure and flow rate in arteries is high. Blood flow in the arteries cannot stagnate.

Answer 2

arteries don't have valves because the blood that flows through it has a LOT of pressure. If there were valves in arteries, they might burst...as on the other hand veins have valves because the De-oxygenated blood (blue blood) cntnz less pressure and so the blood could flow in 1 way only needs valves..... =)

Answer 3

The aorta actually does require one valve; it seperates the heart from the aorta and it is located where the aorta moves upwards before bending downwards towards tissue requiring bloodsupply.
This valve prevents regurgitation of blood due to the suction power of the heart after contraction and gravity.

In the veins, valves prevent backflow of blood that would occur due to gravity. Since the aorta does not have to battle gravity, and because the heart normally has adequate power to get the blood where it needs to be, the aorta does not require valves.

Answer 4

The blood in arteries is under direct pressure from the pumping heart and does not need little valves to keep the blood moving in the correct direction.

Answer 5

no, only veins have valves, because they do not have the same pressure on the vessel as arteries do.