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#beating heart
#heart muscle
#myocardium
#heart contraction
#pump
#cardiology
#physiology
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#heart contraction
#squeeze
#pump blood
#cardiac cycle
#ventricular contraction
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#elotsys
#diastole
#heart contraction
#heart relaxation
#heart phases
#squeeze relax
#heart pump
#beating heart #heart muscle #myocardium #heart contraction #pump #cardiology #physiology