The auricle is the term given to the developing heart of a foetus. In a fully developed heart these chambers are given the term atrium. Although you say there at a cycle of 0.8 seconds there are 72 beats per minutes, this is just an average value and not everyone's heart will beat at exactly the same rate. Furthermore a cycle of 0.8 seconds would give a heart rate of 75 by my calculations.
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Their is some microseconds time lage between every beat