Function of Endocrine system Endocrine system, composed of endocrine gland (classical) and cells(non-classical), independently or along with nervous system and immune system, coordinate complex body functions, such as metabolism growth and development reproduction etcFunction of Endocrine system  Endocrine system, composed of endocrine gland (classical) and cells (non-classical), independently or along with nervous system and immune system, coordinate complex body functions, such as metabolism, growth and development, reproduction etc