<prompt> The duration of atrial systole is:0.80 second0.57 second0.11 second0.44 second  <response>: When the heart beats at a normal rate of 72minute, duration of each cardiac cycle is about 0.8 second. ATRIAL EVENTS Atrial events are divided into two divisions: Atrial systole 0.11 0.1 sec.Atrial diastole 0.69 0.7 sec. VENTRICULAR EVENTS Ventricular events are divided into two divisions: Ventricular systole 0.27 0.3 sec Ventricular diastole 0.53 0.5 sec. In clinical practice, the term systole refers to ventricular systole and diastole refers to ventricular diastole. Ventricular systole is divided into two subdivisions and ventricular diastole is divided into five subdivisions. 