THE CARDIAC CYCLE

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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 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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