?:definition
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Any process that modulates the frequency or rate of heart contraction. [GOC:dph, GOC:tb, PMID:10358008]
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Any process that modulates the frequency, rate or extent of heart contraction. Heart contraction is the process in which the heart decreases in volume in a characteristic way to propel blood through the body. [GOC:dph, GOC:go_curators, GOC:tb]
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