Tricuspid &Biscupid Valve
The tricuspid valve is the valve found between the right atrium and the right ventricle. It basically forms a boundary between the right atrium and the ventricle. It is also called right atrio-ventricular valve. On the other hand, the bicuspid valve is the valve present between the left atrium and the left ventricle. It is also called the mitral valve. They maintain a unidirectional blood flow.
Pulmonary and Aortic Valve
The pulmonary valve lies at the edge of the major blood vessel, the pulmonary trunk. Its function is to prevent the backward flow of the blood from the pulmonary artery into the right ventricle. The aortic valve lies between the left ventricle and the aorta. Its function is to prevent the backward flow of the blood from the aorta to the left ventricle. This valve closes when the ventricle relaxes.