During the cardiac cycle, which mechanical event immediately follows atrial repolarization?

A) Atrial systole
B) Ventricular diastole
C) Ventricular systole
D) Atrial diastole
E) Diastole of all four heart chambers

Cardiac Cycle

The series of events that occur from the beginning of one heartbeat to the beginning of the next, including systole (contraction of the heart muscle) and diastole (relaxation of the heart muscle).

Atrial Repolarization

The part of the cardiac cycle in which the atria return to their resting state by the re-entry of potassium ions into the cells, often masked by ventricular depolarization on an ECG.

Systole

The phase of the cardiac cycle when the heart contracts, pumping blood out of the ventricles and into the systemic circulation.