Hormones. By: dr. hassan el- banna. What is a Hormone?. A hormone is a chemical substance released by a cell or a gland in one part of the body that sends out messages that affect cells in other parts of the organism. The Endocrine System .
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By: dr. hassan el-banna
The major glands of the endocrine system are the hypothalamus, pituitary, thyroid, parathyroids, adrenals, pineal body, and the reproductive organs (ovaries and testes). The pancreas is also a part of this system; it has a role in hormone production as well as in digestion.
The anterior lobe produces the following hormones, which are regulated by the hypothalamus:
Adrenocorticotropin hormone (ACTH)Stimulates the adrenal gland to produce several related steroid hormones.
The inner part, produces hormones called catecholamines (for example, adrenaline).