Cardiovascular System
- Created by: lucyholly16
- Created on: 01-02-15 19:50
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- Cardiovascular System
- The Cardiac Cycle
- a sequence of events that make up one heart beat and lasts for approximately 0.8 seconds
- Diastole
- the heart releases for 0.5 seconds during which time the following occurs.
- the atria fills with blood while the atrioventricular valves are closed
- the atrioventricular valves are pushed ope as atrial pressures rises, blood begins to fill the ventricles. The semi-lunar valves are closed
- the atria fills with blood while the atrioventricular valves are closed
- the heart releases for 0.5 seconds during which time the following occurs.
- Systole
- contraction occurs lasting approximately 0.3 seconds. Atrial systole is followed by ventricular systole
- Atrial Systole
- the atria contracts forcing all the blood past the atrioventricular valves into the ventricles. The semi lunar valves are closed
- Ventricular Systole
- the atrioventricular valves remain closed, pressure inside the ventricles continues to rise. The ventricles continue to contract, until the increased pressure pushes open the semi-lunar valves. As a result blood flows into the pulmonary and systemic circulatory systems
- The Cardiac Cycle
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