How do you explain the function of the heart valves?

Answer 1

enforce a one way blood flow through the heart chambers
the valves prevent the blood from going backwards. they keep the blood flowing forwards! we just dissected a heart in science today so i know for sure thats what they do :)

Answer 2

The valves of the heart prevent the back flow of blood during its contractions. There are four chambers of the heart. Blood enters the right atrium (top right) during the relaxed phase of the heart beat. Then the top half of the heart contracts pushing blood down the the right ventricle. Between these two chambers there is the tricuspid valve. This valve prevents the blood from flowing back to the top chamber. There are 4 valves in the heart all doing the same job.
The heart has two upper chambers called the right and left atria and two lower chambers called the right and left ventricles. On the right side of the heart, blood lacking oxygen returns from the body into the right atrium. The tricuspid valve connects the right atrium to the right ventricle and opens allowing blood to flow from the right atrium to the right ventricle when the heart is not contracting. When the heart contracts, the tricuspid valve closes preventing blood from flowing backwards from the right ventricle into the right atrium. Then the right ventricle ejects blood across the pulmonic valve into the pulmonary arteries and eventually the lungs. The pulmonic valve closes preventing blood from flowing backwards from the lungs into the right ventricle. After blood passes through the lungs, picking up oxygen, it arrives in the left atrium and crosses the mitral valve into the left ventricle. When the heart contracts, the mitral valve closes, preventing blood from flowing backwards from the left ventricle to the left atrium. The left ventricle ejects blood across the aortic valve into the aorta and the rest of the body. Then the aortic valve closes, preventing blood from flowing backwards from the body into the left ventricle. Of course in reality, blood flows to both sides of the heart at the same time, with heart valves on both sides opening and closing at the same time.

Answer 3

The normal human heart has four valves. Valves, when working properly, allow blood to flow in one direction only to the different chambers of the heart. There four valves are called the mitral valve, the tricuspid valve, the aortic and pulmonary valves. Each valve works for a specific chamber of the heart. Occasionally a congenital defect or other problem can cause the valves in the heart to stop working efficiently. In this event surgery can usually correct faulty valves and restore proper blood flow to the chambers of the heart.

Answer 4

We need valves (thin, flap-like structures attached to the heart walls) so that it can stop the blood from flowing backwards.

Answer 5

The valves in the heart prevent the back flow of blood.