a) removal of excess heat from bodythe integumentary system (ie: skin, hair, etc) coordinates with the circulatory system to remove excess heat from the body. The superficial blood vessels (nearest the skin surface) dilate to allow the heat to exit the bodyNOT B b/c the hormonal influence on bp is the result of the relationship b/w the circulatory system and the endocrine systemNOT C b/c the urinary system is responsible for assisting in the regulation of blood's pressure and volumeNOT D b/c the skeletal system is responsible for assisting in the development of blood vessels w/in the marrow