How do heart valves work?

Hint: The heart has 4 chambers, 2 upper chambers (atria) and 2 lower chambers (ventricles). Blood goes through a valve prior to leaving each office of the heart. The valves forestall the regressive progression of blood.

Complete answer:
When the left ventricle relaxes then the aortic valve closes and the mitral valve opens. This lets flow of blood from the left atrium into the left ventricle. When the left atrium contracts this lets even more blood flow into the left ventricle.The mitral valve closes when the left ventricle contracts, and the aortic valve opens. This is so blood flows into the aorta and out to the rest of the body.

The right ventricle relaxes While the left ventricle is relaxing, This leads the pulmonary valve to close and the tricuspid valve to open. This lets the flow of blood into the right ventricle that was returned to the right atrium from the body.

When the left ventricle contracts, the right ventricle also contracts. This causes the pulmonary valve to open and the tricuspid valve to close. Blood flows to lungs from the right ventricle before it is returned to the left atrium as fresh, oxygenated blood.

Note: The four valves are to open and near let blood course through the heart. The means underneath shows how the blood courses through the heart and portrays how every valve attempts to keep blood moving.