When a valve doesn't completely close such as in the disease Mitral valve stenosis blood is allowed to black flow and pool in chambers which makes the heart work less effectively.
AV (Atrioventricular) Tricuspid between the right atrium and ventricle, Bicuspid (Mitral) between the left atrium and ventricle,Semilinar valves = pulmonic valve between the right ventricle and the...