Heart valves are parts of the heart that open and close to allow blood to pass from one part of the heart to another. A well-labelled heart diagram showcases these valves properly. The four valves of the heart are listed below:Aortic Valve: The aortic valve has three leaflets. They open to allow blood to flow from the left ventricle of your heart to the aorta. This transports oxygenated blood from the heart to the rest of the body. The aortic valve prevents aortic backflow into the left ventricle.Mitral Valve: The mitral valve has two leaflets. They allow blood from the lungs to pass into the left atrium. Furthermore, they inhibit backflow from the left ventricle to the left atrium.Pulmonary Valve: The pulmonary valve contains three leaflets as well. They allow blood to be transported from the right ventricle to the pulmonary artery. This artery transports blood to the lungs, where it picks up oxygen.Tricuspid Valve: This has three leaflets. They facilitate blood flow from the right atrium to the right ventricle. They also keep blood from returning from the right ventricle to the right atrium.