Heart Valves Uncovered 🩺🫀 . . Heart valves are crucial components of the cardiovascular system that help regulate blood flow through the heart. There are four main valves in the human heart Tricuspid Valve Located between the right atrium and right ventricle, it has three leaflets and prevents backflow of blood into the atrium when the ventricle contracts. Pulmonary Valve Situated between the right ventricle and the pulmonary artery, this valve opens to allow blood to flow to the lungs for oxy