Which of the following events takes place in human heart when it pumps the blood into arteries:- (i) contraction of ventricles (ii) contraction of Atria (iii) closure of semilunar valves (iv) closure of auriculo ventricular valves.
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Your atria and ventricles contract to make your heart beat and to pump the blood through each chamber. Your heart chambers fill up with blood before each beat, and the contraction pushes the blood out into the next chamber.
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