Inc. The endocrine glands provide the body with chemicals called hormones. Not all cells within the body are affected by hormones, and only some cells of a particular organ may respond to a specific hormone.
Some hormones control the release of other hormones.
For example, the pituitary gland located at the base of the brain produces many hormones. These hormones act on other glands such as the adrenals and cause them to release their own hormones. Pituitary hormones control the hormone release for other endocrine glands, including the thyroid, parathyroid, adrenal, ovaries, testicles and pancreas. The thyroid gland, once stimulated, produces its own hormone, thyroxine. The ovaries, once stimulated by FSH and LH from the pituitary, principally produce progesterone and estrogens .