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britannica.com
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Britannica online encyclopedia article on systole (heart function), period of contraction of the ventricles of the heart that occurs between the first and second heart sounds. Systole causes the ejection of blood into the aorta and pulmonary trunk. Lasting usually 0.3 to 0.4 second, ventricular systole is introduced by a very brief period of contraction, followed by...
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