The endocrine system is made up of glands that secrete hormones into the bloodstream.
Endocrine glands include the pituitary gland, thyroid gland, parathyroid glands, adrenal glands (suprarenal), pancreas, ovaries/testes, pineal body, thymus, and hypothalamus.
Hormones are chemical messengers produced by various organs or tissues, which travel through the blood to target cells where they bind to specific receptors on the cell surface or inside the cell.
