biology 1

cardiac cycle

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Atrial Systole

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atria contract

blood is forced through the atrioventricular valves into ventricles

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Ventricular systole

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Ventricles contract.blood is forced through the valves into the arteries

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Muscles of ventricle contract

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Sinoatrial node

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A group of cells that produce regulat waves of electrical activity, near the top of the right atrium.

often called the hearts pacemaker

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