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                                    What is Chemistry ???? thanks dear (◠‿◕)janvii ji notification blast ho gaya aur thanks mat do ab | 
                            
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Answer»  helloExplanation:The CARDIAC cycle describes all the activities of the heart through one complete heartbeat—that is, through one CONTRACTION and RELAXATION of both the atria and VENTRICLES. A contraction event (of EITHER the atria or ventricles) is referred to as systole, and a relaxation event is referred to as diastole.  | 
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