THE CARDIAC CYCLE
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Last updated 2:00 PM on 12/18/25
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4 Terms
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1- Atrial contraction
Blood from lungs goes to left atrium and blood from body to right atrium simultaneously- atria contract increasing pressure forcing blood out into relaxed ventricles
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2- Ventricular contraction
Atria relax and ventricles contract, increasing their pressure, shutting atrioventricular valves- blood forced out of ventricles and heart via pulmonary artery/aorta
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3- Relaxation
Blood pressure in pulmonary artery/aorta is high, shutting semilunar valves- ventricles and atria relax, opening atrioventricular valves and blood flows into them from pulmonary vein and vena cava
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REPEAT
