these cells function as the key regulators of the body overall energy metabolism
Dear aspirant,
The mamalian immune system implements remarkably a effective set of mechanisms for fighting pathogens1. It's main components are haematopoetic immune cells including myeloid cells that control innate immunity and lymphoid cells that constitute adaptive immunity. However immune functions are not unique to hamomatopeitic cells.
So, all in all structural cells are key regulators of the body.