Which valve prevents backflow of blood into the right ventricle?

Q.

What prevents the backflow of blood inside the heart during contraction ?
(a) thick muscular walls of ventricles
(b) valves
(c) thin walls of atria
(d) all of the above

Q. Match the following.

Aortic valve	Prevents backflow of blood from right ventricle to right atrium
Tricuspid valve	Prevents backflow of blood from left ventricle to left atrium
Bicuspid valve	Prevents backflow of blood from aorta to ventricle

Q. Complete the following passage:

Valves function to prevent backflow of blood and maintain a unidirectional circulation of blood within the body. The (i)__________ valve separates the right atrium from the right ventricle whereas the (ii)_____________ valve separates the left atrium and left ventricle. The (iii)___________ valve prevents the backflow of deoxygenated blood from the pulmonary artery into the right ventricle while the (iv)__________ valve prevents the backflow from aorta into the left ventricle.

Q.

State whether the following statements are true or false.

(xiii) Tricuspid valve prevents the reverse flow of blood from the right ventricle into the right auricle.