The Endocrine System
The endocrine system comprises a group of specialized organs and body tissues that produce, store, and secrete hormones. Endocrine organs are sometimes called ductless glands because their secretions are released directly into the bloodstream.
Endocrine system hormones regulate metabolism, body growth, and development; control the function of various tissues; and support reproductive functions, including pregnancy.
The primary glands of the human endocrine system are the hypothalamus, pituitary, thyroid, parathyroid, adrenal, pineal, and the reproductive glands: the ovary and testis. The pancreas – associated with the digestive system – is also considered part of the endocrine system.