Hormones Definition A hormone is something produced in the body that circulates in the bloodstream and then influences the activity of living cells that are far from where it was produced. Because hormones travel to their target tissue, they are sometimes referred to as signaling molecules. For example, estrogen is produced by the ovaries, but
Hormones are chemical substances that are produced, stored, and released into the bloodstream by secretory structures (glands) of the endocrine system. The endocrine system, in turn, is designed to modulate various body functions, including digestion, metabolism, growth and development, reproduction, and response to stress and injury. Hormones are released by specific glands, move through the