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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.
Wiki User
∙ 6y ago
Wiki User
∙ 12y agoarteries 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..... =)
Wiki User
∙ 14y agoThe 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.
Wiki User
∙ 12y agoThe 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.
Wiki User
∙ 13y agono, only veins have valves, because they do not have the same pressure on the vessel as arteries do.
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Do the larger arteries contain valves to prevent the back flow of blood?
No, veins have the valves, arteries don't.
What do arteries contain that prevent the back flow of blood?
Nothing, it is only pressure that keeps blood moving in the right direction in arteries. Veins have valves that prevent backflow of blood, but arteries do not.
Do arterioles have valves?
No; arteries (and arterioles) depend on smooth muscle contraction, whereas veins (and venules) have valves.
Do arteries have valves to allow blood to flow away from the heart?
No, they're aren't any valves in the arteries.
Why coronary arteries Aries close to the semilunar valves?
During cardiac systole the left ventricle contracts, the semi lunar valves open and occlude the coronary arteries. During diastole the valves close and because of the elasticity of the aorta which has just been stretched blood now flows into the coronary arteries. The reason for this is that it is easier to supply blood to the cardiac muscle when it is relaxed.
Do the arteries of limbs has valves?
No arteries have valves, only veins have valves to stop backflow.
Does arteries have valves to prevent back flow?
No, veins have the valves, arteries don't.
Do the larger arteries contain valves to prevent the back flow of blood?
No, veins have the valves, arteries don't.
What do arteries have that veins do not?
valves
What do veins have that arteries do not?
valves
What do arteries contain that prevent the back flow of blood?
Nothing, it is only pressure that keeps blood moving in the right direction in arteries. Veins have valves that prevent backflow of blood, but arteries do not.
What statement is true of arteries?
Arteries carry blood with oxygen to the heart. Veins carry blood full of carbon dioxide to the lungs. Arteries have a thick wall. Veins have a thin wall. Arteries have no valves. Veins have valves.
What do the valves in arteries do?
Valves function to help keep blood flowing toward the heart. Arteries function to carry blood away from the heart.
How many valves are there in artery?
Arteries are valve-less vessels, meaning there are no valves.
Why are valves not present in arteries?
valves are not present in arteries because in arteries there is high blood pressure
What are the chambers connected by?
Veins, arteries or valves
Arteries contain valves that do what?
No arteries do not contain valves since there is enough pressure from the heart to force blood through these vessels without significant backflow between contractions.
