A) Aortic and pulmonary valves control the flow of blood into the heart.
B) The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
C) The tricuspid valve divides the left atrium from the left ventricle.
D) The mitral valve separates the right atrium from the right ventricle.