Multiple choice

One complete contraction and relaxation of the heart is called

  1. dialysis

  2. heart beat

  3. blood pressure

  4. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A heartbeat is one complete cycle of cardiac contraction (systole) and relaxation (diastole). Dialysis is blood filtration, blood pressure is the force of blood against vessel walls - neither describes the cardiac cycle.