What does an average cardiac cycle take in seconds?

the cardiac cycle includes all events associated with the blood flow throught the heart during one complete heartbeat, that is, atrial systole and diastole followed by ventricular systole and diastole. the lenght of of the cardiac cycle is about 0.8 s, with atrial systole accounting for 0.1 s adn ventricular systole 0.3 s. the remaining 0.4 s is a period of total heart relaxation, assuming the average heart beats 75 times each minute.