Heart Valves

Blood is pumped through the chambers, aided by four heart valves. The valves open and close to let the blood flow in only one direction.

Source : http://www.csmc.edu/heartcenter/images/aorticvalve_l.jpg

-The tricuspid valve is between the right atrium and right ventricle.

-The pulmonary or pulmonic valve is between the right ventricle and the pulmonary artery.
-The mitral valve is between the left atrium and left ventricle.
-The aortic valve is between the left ventricle and the aorta.

Source : http://www.tuesdaynitedesign.com/edproj/units/images/chvalves.gif