Definition of rector for English Language Learners. : 1  a priest or minister who is in charge of a church or parish. : 2  a person who is in charge of a university or school.
Cardiac Cycle. in Physiology. Cardiac events appearing from the beginning of one heart beat to the beginning of next heart beat and repeating themselves successively. â¢ Cardiac cycle time (H.Rate = 75/min) : 0.8 sec. Systole: 0.27 sec. Diastole: 0.53 sec.
Diagram showing the flow of blood in the heart. What I just described is one cardiac cycle, or the sequence of events in a single heartbeat. Since the average heart beats about 75 beats per minute, the length of each cardiac cycle is less than one second. But, during that brief period of time, there's a lot of pressure changes taking place in the heart.