The Cardiac Cycle
- Created by: cara12
- Created on: 18-04-19 09:35
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- The Cardiac Cycle
- Cardias diastole is the relaxation of the cardiac muscle, firstly of the atria then the ventricles
- Cardiac systole is the contraction of the cardiac muscle, firstly the atria then the ventricles
- Diastole
- As the atria and then the ventricles relax, they expand drawing blood into the atria
- The pressure in the atria increases opening AV valves
- Blood passively enters the ventricles
- SL valves are closed to prevent blood from leaving the heart
- Atrial systole
- The atria contract, forcing remaining blood into the ventricles
- Ventricular systole
- The ventricles contract, increasing the pressure closing AV valves to prevent backflow into the atria
- SL valves are forced open as blood is ejected from the ventricles into the aorta and pulmonary
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