Cardiac cycle
| Cardiac cycle | |
|---|---|
| Organisms | Animalia |
| Biological system | Circulatory system |
| Health | Beneficial |
| Action | Involuntary |
| Method | Blood is allowed to enter relaxed ventricle chamber from vein through venous valve. Heart muscle contracts ventricle and blood is expelled through arterial valve to artery. |
| Outcome | Circulation of blood per minute (Humans) |
| Duration | 0.6–1 second (Humans) |
| *Animalia with the exception of Porifera, Cnidaria, Ctenophora, Platyhelminthes, Bryozoan, Amphioxus. | |
The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next.[1] It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, following a period of robust contraction and pumping of blood, called systole.[1] After emptying, the heart relaxes and expands to receive another influx of blood returning from the lungs and other systems of the body, before again contracting.
Assuming a healthy heart and a typical rate of 70 to 75 beats per minute, each cardiac cycle, or heartbeat, takes about 0.8 second to complete the cycle.[2][3] Duration of the cardiac cycle is inversely proportional to the heart rate.[4]
- ^ a b c Pollock JD, Makaryus AN (3 October 2022). "Physiology: Cardiac cycle". StatPearls Publishing, US National Library of Medicine. Retrieved 28 March 2024.
- ^ a b Silverthorn, DU (10 November 2022). "Constructing the Wiggers diagram using core concepts: a classroom activity". Advances in Physiology Education. 46 (4). doi:10.1152/advan.00046.2022.
- ^ Gersh, Bernard J (2000). Mayo Clinic Heart Book. New York: William Morrow. pp. 6–8. ISBN 0-688-17642-9.
- ^ Hall JE, Hall ME (2011). Guyton and Hall Textbook of Medical Physiology (12th ed.). Philadelphia: Elsevier. pp. 104–105. ISBN 978-1-4160-4574-8.