41.   The patient first bleeds and then goes into shock as falling blood pressure leaves the circulatory system unable to pump blood to vital organs.

42.   Then it pumps the blood back into his arm.

43.   They do not pump blood adequately into the bottom chambers, the ventricles, which speed up.

44.   This is how blood is pumped against gravity from the legs back to the heart.

45.   They work by improving blood flow and reducing the effort it takes for the heart to pump blood.

46.   Walking helps your muscles pump blood back to your heart.

47.   When blood is pumped through a weakened aorta, the aorta bulges out like a balloon at the weak spot.

48.   Young needed a new heart because an unknown virus attacked his heart, causing it to become so weak it was unable to pump blood adequately.

49.   Because fetuses do not breathe, blood does not need to flow through the artery which pumps blood into the lungs to pick up oxygen.

50.   Congestive heart failure is a disease in which the heart loses its contracting power and is unable to pump enough blood to satisfy the body.