Valves are present in between the auricles and ventricles of the heart. Give one reason.

Human heart has various types of valves present in between the different chambers. Bicuspid valve is present between the left atrium and ventricle whereas tricuspid valve is present in between the right auricle and the right ventricle.

Semilunar valve is present between right ventricle & pulmonary artery and left ventricle & aorta. The important role of these valves is to prevent the backflow of blood from the ventricles to the auricles.