| thyroid hormones | Chemical substances made by the thyroid gland which is located in the front of the neck. The thyroid gland uses iodine to make thyroid hormones. Thyroid hormones are essential for the function of every cell in the body. They help regulate growth and the rate of chemical reactions (metabolism) in the body. The two most important thyroid hormones are thyroxine (t4) and triiodothyronine (T3). (12 Dec 1998) |
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| tissue hormones | Hormones synthesised by cells other than those in the endocrine system. Compare: endocrine hormones. (05 Mar 2000) |
| endocrine hormones | Hormones produced by the endocrine system. Compare: tissue hormones. (05 Mar 2000) |
| tropic hormones | Trophic hormones, those hormone's of the anterior lobe of the pituitary that affect the growth, nutrition, or function of other endocrine glands. (05 Mar 2000) |
| juvenile hormones | Compounds, either natural or synthetic, which block development of the growing insect. (12 Dec 1998) |