Biology for IGCSE & O level - Transport In Animals (Section 1 - No. 11)
Which of the following is the correct sequence of events in the cardiac cycle?
Atrial systole -> ventricular diastole -> ventricular systole -> atrial diastole
Atrial diastole -> ventricular systole -> atrial systole -> ventricular diastole
Atrial systole -> ventricular systole -> atrial diastole -> ventricular diastole
Ventricular systole -> atrial systole -> ventricular diastole -> atrial diastole
Explanation
The correct sequence: atria contract (systole), ventricles contract (systole), atria relax (diastole), ventricles relax (diastole).
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