Question

Define a cardiac cycle.

Answer 1

1. The heart's cyclical repetition of successive events, known as the cardiac cycle, is made up of the contraction and relaxation of the ventricles and atria during diastole.
2. A cardiac cycle lasts about 0.8 seconds. The trial systole (0.1 second), ventricular systole (0.3 second), and full cardiac diastole (0.4 second) are the phases of the heart cycle.