Cardiac Cycle
- Created by: _laurenb
- Created on: 08-04-15 14:56
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- The Cardiac Cycle
- Diastole
- 1st stage
- Relaxation of cardiac muscle
- Blood enters the atria
- AV valves open and blood slowly enters ventricles
- HIGH blood pressure in atria as blood enters
- LOW blood pressure in arteries
- Semilunar valves shut
- Atrioventricular valves open
- Atrial Systole
- Contraction of atria
- Atria completely emptied into ventricles
- AV valves fully open
- Semilunar valves shut
- HIGH pressure in ventricles as blood enters
- Pressure in atria decreases as blood leaves
- 2nd stage
- Ventricular Systole
- Contraction of ventricles
- 3rd Stage
- Blood emptied from ventricles into arteries
- HIGH pressure in arteries
- LOW pressure in atria and in ventricles as blood leaves
- AV valves are shut and are held like this by tendons
- Semilunar valves open when ventricular pressure is higher than arterial pressure
- Diastole
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