Cardiac Cycle
- Created by: Eema003
- Created on: 15-05-16 15:02
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- Cardiac Cycle
- The Atria and ventricles are relaxed and emptied
- Blood at low pressure enters the atria
- As they fill up the blood pressure in the atria increases
- When the pressure exceeds that of the ventricles blood flows through the atrioventricular valves into the ventricles
- The Atria Contract
- The contraction empties the atria
- The Ventricles contract almost immediately
- This increases the pressure in them above that in the pulmonary arteries and aorta
- Blood flows into the pulmonary arteries and the aorta
- The elastic walls of the aorta stretch to accommodate the blood
- The Ventricles and atria relax
- The pressure in the ventricles is now less than in the pulmonary arteries and the aorta
- The backflow of blood is prevented by the semi-lunar valves
- The pressure in the ventricles is now less than in the pulmonary arteries and the aorta
- The Ventricles and atria relax
- The elastic walls of the aorta stretch to accommodate the blood
- Blood flows into the pulmonary arteries and the aorta
- This increases the pressure in them above that in the pulmonary arteries and aorta
- The Ventricles contract almost immediately
- The contraction empties the atria
- The Atria Contract
- When the pressure exceeds that of the ventricles blood flows through the atrioventricular valves into the ventricles
- As they fill up the blood pressure in the atria increases
- Blood at low pressure enters the atria
- The Atria and ventricles are relaxed and emptied
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