which glands produce and release chemicals directly into the bloodstream
For example the kidney secretes endocrine hormones such as erythropoietin and renin. The endocrine system is made up of a series of glands that produce chemicals called hormones. A number of glands that signal each other in sequence is usually referred to as an axis, for example, the hypothalamic-pituitary-adrenal axis. 11 people found this useful.