EasyZoologyBody fluid and circulation
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Which of the following is the correct sequence of events in the cardiac cycle?
A
Atrial systole → Ventricular systole → Joint diastole
B
Ventricular systole → Atrial systole → Joint diastole
C
Joint diastole → Ventricular systole → Atrial systole
D
Atrial systole → Joint diastole → Ventricular systole
Explanation
The cardiac cycle begins with atrial systole (contraction of atria), followed by ventricular systole (contraction of ventricles), and then joint diastole (relaxation of both atria and ventricles). This complete cycle lasts about 0.8 seconds at a normal heart rate of 72 beats per minute.
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