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Stem cells are unspecialised cells that can differentiate and be used to repair various tissues, including heart one. When used in medical interventions, they need to be gathered from somewhere and they are often taken from bone marrow when used to repair heart tissue. Where they come from is not important in the sense that they always have this ability to differentiate and become specialised cells for the tissues in which they are inserted. And in this way, they can repair damaged tissues.
The main point here is that heart tissue is cardiac muscle. Somatic (body/bone marrow) stem cells are able to be used for growth and repair. They are able to differentiate into muscle cells, and to the larger purpose of muscular tissue. It does depend on your exam board and what level we’re talking about?