cardiac cycle

noun
one complete heartbeat, consisting of one contraction and relaxation of the heart.
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American Heritage
Medical Dictionary

cardiac cycle n.
A complete beat of the heart, including systole and diastole and the intervals between, beginning with any event in the heart's action to the moment when that same event is repeated.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
cardiac cycle  
The rhythmic contraction (systole) and relaxation (diastole) of the chambers of the heart that corresponds to one heartbeat. During the cardiac cycle, blood is pumped out of the heart into the aorta and the pulmonary artery, and blood reenters the heart from the venae cavae and the pulmonary veins. The heart's valves open and close in response to pressure differences between the chambers.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Systole is the contraction phase of the cardiac cycle, and diastole is the relaxation phase.
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