MEDICAL PHYSIOLOGY

Detailed explanation-1: -As the heart muscle contracts and relaxes, the valves open and shut. This lets blood flow into the ventricles and atria at alternate times.

Detailed explanation-2: -The valves open and close to control or regulate the blood flowing into the heart and then away from the heart. Three of the heart valves are composed of three leaflets or flaps that work together to open and close to allow blood to flow across the opening.

Detailed explanation-3: -If the valve doesn’t open fully, it will block or restrict the flow of blood. This is called valve stenosis or valve narrowing. If the valve doesn’t close fully, the blood will leak back into the heart instead of forwards into the body. This is called valve incompetence, valve regurgitation or a leaky valve.

Detailed explanation-4: -The stellate orifice occurs when the ventricular pressure equals the aortic pressure. commissures causes the leaflets to separate and the valve to open.