MEDICAL PHYSIOLOGY

Detailed explanation-1: -As the heart muscle contracts and relaxes, the valves open and close, letting blood flow into the ventricles and out to the body at alternate times.

Detailed explanation-2: -All four valves open and close to help move blood from one area to another. Two of the valves, the mitral and the tricuspid valves, move blood from the upper chambers of the heart (the atria) to the lower chambers of the heart (the ventricles).

Detailed explanation-3: -Considering there are four valves in the heart, which open-and-close with each heart beat, the answer is… 400, 000. To see how the heart valves open-and-close, watch this video titled, “How The Heart Works“.

Detailed explanation-4: -When the left ventricle contracts, the mitral valve closes and the aortic valve opens. This is so blood flows into the aorta and out to the rest of the body. While the left ventricle is relaxing, the right ventricle also relaxes. This causes the pulmonary valve to close and the tricuspid valve to open.