When the ventricles of the heart contract, the contraction pushes blood into the aorta. This is called ____________________. When the ventricles relax, returning blood refills the heart chambers. This is called ____________________.

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The Answer of When the ventricles of the heart contract, the contraction pushes blood into the aorta. This is called ____________________. When the ventricles relax, returning blood refills the heart chambers. This is called ____________________.

When the Ventricles of the Heart Contract, the Contraction Pushes