The Cardiac Cycle
- Created by: emilyowl
- Created on: 10-05-16 13:36
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- CARDIAC CYCLE
- RELAXATION OF THE HEART..{diastole}
- Blood returns to the heart atria
- Pulmonary vein - from lungs
- Vena cava - from body
- Atria pressure exceeds ventricular pressure
- Atrioventricular valves open
- Blood passes into the ventricles
- Relaxation of ventricle walls means they can recoil
- Reduces pressure in ventricle
- Pressure in ventricle is lower than in aorta and pulmonary artery
- Semi - lunar valves close
- 'DUB'
- Semi - lunar valves close
- Pressure in ventricle is lower than in aorta and pulmonary artery
- Reduces pressure in ventricle
- Relaxation of ventricle walls means they can recoil
- Blood passes into the ventricles
- Atrioventricular valves open
- Atria and ventricles are relaxed
- Blood returns to the heart atria
- CONTRACTION OF ATRIA........... {atrial systole}
- Contraction of atrial walls
- Forces remaining blood into ventricles from atria
- Relaxed ventricle walls
- Muscles of ventricle walls stay relaxed
- Relaxed ventricle walls
- Forces remaining blood into ventricles from atria
- Relaxed ventricle walls
- Muscles of ventricle walls stay relaxed
- Contraction of atrial walls
- CONTRACTION OF VENTRICLES... {ventricular systole}
- Ventricles fill with blood
- Walls contract simultaneously
- Increases blood pressure in them
- Forcing shut the atrioventricular valves
- Prevents backflow into the atria
- 'LUB'
- Pressure rises further
- Pressure exceeds the aorta and pulmonary artery
- Blood is forced into aorta and pulmonary artery
- The thick muscular walls forcefully contract
- Creates high pressure necessary to pump blood around the body
- Thick wall of left ventricle
- Pumps blood to the extremities of the body
- Thinner wall of right ventricle
- Pumps blood to the lungs
- Thick wall of left ventricle
- Creates high pressure necessary to pump blood around the body
- The thick muscular walls forcefully contract
- Blood is forced into aorta and pulmonary artery
- Pressure exceeds the aorta and pulmonary artery
- Forcing shut the atrioventricular valves
- Increases blood pressure in them
- Walls contract simultaneously
- Ventricles fill with blood
- RELAXATION OF THE HEART..{diastole}
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