What valves prevent blood from flowing backwards from the arteries into the heart?

Answer 1

All the valves of the heart prevent backflow of the blood through the heart: tricuspid valve, pulmonary valve, mitral valve, and aortic valve.

Furthermore, there are one-way valves in the veins that prevent backflow of blood.

Answer 2

The valves are arranged inwards out such that they allow blood to flow in a given direction but not the other i.e It's their shape that helps in the mechanism.

Take an example of a piston of your bike. Get it out and blow in it from both sides one side at time. That will help you on the mechanism of the valves.

Answer 3

Yes! 4 valves in the heart; the 2 semi-lunar (on the aorta and the pulmonary artery) and the bicuspid and tricuspid values AKA the atrioventricular valves between the atriums and the ventricles all prevent backflow.

Answer 4

Four valves prevent the backflow of blood during the cardiac cycle. The atrioventricular valves (bicuspid or mitral on the left, tricuspid on the right) prevent the backflow of blood from the ventricles to the atria. The semilunar valves (aortic on the left, pulmonary on the right) prevent the backflow of blood from the arteries to the ventricles.

Answer 5

The semilunar valves prevent blood from flowing backwards from the arteries into the heart. The right semilunar valve prevents backflow from the pulmonary artery, and the left semilunar valve prevents backflow from the aorta.

Answer 6

Four valves prevent the backflow of blood in the heart. The atrioventricular valves (mitral on the left, tricuspid on the right) prevent backflow from the ventricles to the atria. The semilunar valves (aortic on the left, pulmonary on the right) prevent backflow from the arteries to the ventricles.