Endocrine system

Endocrine system, ductless glands that secrete chemicals called hormones, which regulate body functions. These organs and their general location are: pituitary gland in the brain, thyroid gland in the neck, parathyroid glands in the neck, adrenal glands in the abdomen, pancreas in the abdomen, ovaries in the abdomen (in females), and testes in the scrotum (in males). The hormones produced by the endocrine glands are extremely potent chemical substances that are effective in very minute quantities. They are secreted directly into the bloodstream and transported throughout the body.

See also: Hormone.