systole

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systole

contraction of the heart, during which blood is pumped into the aorta and the arteries that lead to the lungs
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Systole

 

the contraction of cardiac muscle, or the myocardium. A systole consists of separate but successive atrial and ventricular contractions. The cardiac cycle comprises consecutive systolic and diastolic movement. In man, 75 heart beats per minute are accompanied by atrial and ventricular systoles that last 0.1 sec and 0.3 sec, respectively. Blood enters the ventricles from the atria during atrial systole and is ejected into the vascular system during ventricular systole.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

systole

[′sis·tə·lē]
(physiology)
The contraction phase of the heart cycle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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NEW ORLEANS -- Uncontrolled systolic hypertension is a strong independent determinant of nocturia in middle-aged African American men, O'Neil Mason, MD, reported at the American Heart Association scientific sessions.
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