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.
No, veins have the valves, arteries don't.
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.
No; arteries (and arterioles) depend on smooth muscle contraction, whereas veins (and venules) have valves.
No, they're aren't any valves in the arteries.
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.
No arteries have valves, only veins have valves to stop backflow.
No, veins have the valves, arteries don't.
No, veins have the valves, arteries don't.
valves
valves
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.
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.
Valves function to help keep blood flowing toward the heart. Arteries function to carry blood away from the heart.
Arteries are valve-less vessels, meaning there are no valves.
valves are not present in arteries because in arteries there is high blood pressure
Veins, arteries or valves
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.