This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
Duration of atrial systole is: 
Select and explain. 
A. 0.53 sec, B. 0.28 sec, C. 0.08 sec, D. 0.11 sec
D: 0.11 sec
Answer: D: 0.11 sec 
Explanation: Ans: d (0.11 sec) Ref: Ganong, 22nd ed, p. 568; Mahapathra, p. 219Duration of various cardiac events* Cardiac cycle-0.8 sec* Ventricular systole-0.27 sec* Ventricular diastole-0.53 sec* Action potential-0.25 sec* Absolute refractory period-0.20 sec* Relative Refractory period-0.05 sec* Isovolumeetric contraction-0.05 sec* Protodiastole-0.04 secEnd diastolic volume- 130mlEnd systolic volume- 50mlEjection fraction (65%)- 70-90mlS1- 0.15secS2- 0.12secS3- 0.1 sec