cardiac cycle
One complete heartbeat
The cardiac cycle is one complete sequence of heart contraction and relaxation—the heartbeat.
It comprises systole (the pumping phase, when chambers contract to push blood out) and diastole (the filling phase, when chambers relax and refill).
A typical resting cycle lasts about 0.8 seconds: The cardiac cycle repeats roughly 100,000 times per day.
- heartbeatRhythmic cardiac contraction
- afterloadArterial opposition to ejection
- preloadInstall in advance
- blood pressureCirculatory force measurement
- blood flowMovement through vessels
repolarization · atria · ventricles · myocardium · heart muscle · mitral valve · aortic valve · thump · tricuspid valve · pulse · ejection · filling · chambers · pumping · electrical impulse · circulation · murmur · aorta
cardiac state
cardiac cycleasystole
Zero cardiac electrical activity
cardiac arrest · flatline · ventricular fibrillation · arrhythmia · cardiac death