Which Is NOT a Correct Association Describing Aspects of the Cardiac

Which is NOT a correct association describing aspects of the cardiac cycle?

A) Each heartbeat constitutes a cardiac cycle.
B) Diastole is contraction of the heart and systole is relaxation.
C) A normal heart rate varies from 60 to 80 beats per minute.
D) A pulse is the expansion and recoil of artery walls felt near the body surface.
E) Valves prevent backflow of blood into the heart when the heart relaxes.