Mac is 13 and has fallen deeply in love with his first sweetheart.  He feels his heart “skip a beat” whenever he sees her. Where are the specialized cardiac cells located that initiate a heartbeat?  Group of answer choices a. Myocardium of the left atrium b. Myocardium of the right atrium c. Endocardium of the left atrium d. Endocardium of the right atrium

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