Complex sentence: In fact, these adrenal medullary cells are modified postganglionic neurons, and preganglionic autonomic nerve fibers lead to them directly from the central nervous system.Adrenal medulla increases available energy; heart rate; and metabolism.
Split into simpler sentences: In fact, these adrenal medullary cells are modified postganglionic neurons, and preganglionic autonomic nerve fibers lead to them directly from the central nervous system. The adrenal medulla increases available energy; heart rate; and metabolism.