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The aim of the study was to describe the boundary between the phases of rapid and slow ejection in the cardiac cycle and to define the exact location of the j point on ECGs. The work is based on the theory of heart cycle phase analysis using mathematical equations of hemodynamics. The balance of phase diastolic and systolic blood volumes depending on the duration of the cardiac cycle phases has been verified by these equations. The interrelation of phase duration and phase blood volumes was employed to exactly define the cardiac cycle boun