define mechanism of circulation short answer
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Blood circulation starts when the heart relaxes between two heartbeats: The blood flows from both atria (the upper two chambers of the heart) into the ventricles (the lower two chambers), which then expand. ... In the systemic circulation, the left ventricle pumps oxygen-rich blood into the main artery (aorta)
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magnesium is a chemical element with symbol mg and atomic number 12 it is shiney grey solid which bears a close physical resemblance to the other five element in the second coloumn group 2 or alkaline earth metals of the periodic table all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure
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