hormones

Page last modified on: June 6, 2008
(HOAR-moanz)

Chemicals made by glands in the body. They circulate in the blood and control the actions of certain cells or organs. For example, estrogen is made in the ovary, travels in the blood to the breast, and can stimulate the growth of breast cells.

Audio contributed by: Marisa Weiss, M.D.

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