EVERYDAY SCIENCE

Detailed explanation-1: -The four valves are the aortic valve, mitral valve, pulmonary valve and tricuspid valve.

Detailed explanation-2: -The aortic and pulmonic valves close preventing backward blood flow into the heart. The mitral and tricuspid valves then open to allow forward blood flow within the heart to fill the ventricles again.

Detailed explanation-3: -There are four valves in the heart: aortic valve, mitral valve, tricuspid valve, and pulmonary valve.

Detailed explanation-4: -Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood. Valves are actually flaps (leaflets) that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle.

Detailed explanation-5: -Unlike arteries, veins contain valves that ensure blood flows in only one direction. But, Arteries don’t require valves because pressure from the heart is so strong that blood is only able to flow in one direction. Valves also help blood travel back to the heart against the force of gravity.