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systole (n.)

"periodic contraction of the heart and arteries," 1570s, from Greek systole "a drawing together, contraction," from syn- "together" (see syn-) + stem related to stellein "to bring together, draw in; to put, set, place," from PIE *stel-yo-, suffixed form of root *stel- "to put, stand, put in order," with derivatives referring to a standing object or place.

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Definitions of systole from WordNet

systole (n.)
the contraction of the chambers of the heart (especially the ventricles) to drive blood into the aorta and pulmonary artery;
From wordnet.princeton.edu