B

Cardiac myocytes function as a branching, electrically coupled “functional syncytium” through intercalated discs rich in gap junctions, and each cell usually contains a single, centrally placed nucleus (occasionally two, but not many) [Dhein & Salameh 2021, PMID 34572071; Metzger 1986, PMID 3515825]. Hence the statement that heart muscle “has multiple nuclei” is the exception.