Cardiac cycle
| Cardiac cycle or cardiac output | |
|---|---|
 MRI video of a teen's heart beating. | |
| 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
|