What do you mean by systolic and diastolic phase? How you correlate it with heart beat?

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Please find below the solution to the asked query 
          
The systolic phase refers to the rhythmic contraction of the chambers of the heart and diastolic phase is the rhythmic relaxation of the chambers of the heart.
The events occurring during one heartbeat is known as cardiac cycle. During this cycle, the auricles and the ventricles of the heart rhythmically contract (systole) and relax (diastole). 

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