21.   The heart pumps blood that is laced with baseball.

22.   The less forgiving the weather, the less it bothers the bearded, hard-eyed quarterback whose heart must pump antifreeze instead of blood.

23.   The heart no longer pumps at the same maximal rate it once did.

24.   The inhibitors block the production of angiotensin, a substance that constricts blood vessels and makes it harder for the heart to pump out blood.

25.   The systolic number measures the highest pressure of blood against the walls of an artery when the heart is pumping.

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

27.   This heart is pumping.

28.   Your heart pumps faster.

29.   The air-powered, two-chambered plastic pump would be used only in situations where no other artificial heart pump now available will suffice.

30.   The heart pumps until still another tube injects a cold dose of potassium solution.