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.
I. Cardiac cycle. A. Consists of one beat, or one P-QRS-T sequence. 1. The sequence: Atrial contraction (systole) and relaxation (diastole), followed by ventricular contraction and relaxation. 2. The cardiac cycle is measured on ECG from one R wave to the next R wave. 3. Between cycles the ECG recorder returns to baseline or isoelectric line  the flat line between the T wave and the next P wave.