A) cardiac output.
B) cardiac cycle.
C) cardiac volume.
D) cardiac tamponade.
E) cardiac measure.

A) left and right atria.
B) right atrium and right ventricle.
C) left and right ventricles.
D) left atrium and left ventricle.
E) left ventricle and the aorta.

A) supply and drain the heart muscle.
B) bypass the heart ventricles.
C) send blood directly to the lungs.
D) are not really necessary because the heart can get its blood supply from the "inside."
E) lead directly from the atria to the ventricles.