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When the heart is pumping blood out - during systole the semi lunar valves (aortic and pulmonary) open - ventricle contracts forcing blood into the aorta and the pulmonary artery

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1. When the heart is pumping blood out - during systole the semi lunar valves (aortic and pulmonary) open - ventricle contracts forcing blood into the aorta and the pulmonary artery





 
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