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What is sadness????❤Good afternoon❤#Ishuhere​

Answer»

good morningkese ho Explanation: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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