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Reference.org
Systole
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<p>Systole is the part of the <a href="/facts/Cardiac_cycle/b93n3ecF">cardiac cycle</a> during which some <a href="/facts/Heart/fF4KSGdk">chambers</a> of the <a href="/facts/Heart/fF4KSGdk">heart</a> contract after refilling with blood. Its contrasting phase is <a href="/facts/Diastole/keHgaxbF">diastole</a>, the relaxed phase of the <a href="/facts/Cardiac_cycle/b93n3ecF">cardiac cycle</a> when the chambers of the heart are refilling with blood. </p>