| progestational hormones | A class of sex hormones associated with certain changes in the uterus and vagina during the menstrual cycle. They are necessary for the development of mammary tissue and for the maintenance of pregnancy. (12 Dec 1998) |
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| progestational hormones, synthetic | Compounds obtained by chemical synthesis that possess progestational activity, but differ in structure from naturally occurring progestational hormones. (12 Dec 1998) |
| hormones | Chemical substances having a specific regulatory effect on the activity of a certain organ or organs. The term was originally applied to substances secreted by various endocrine glands and transported in the bloodstream to the target organs. It is sometimes extended to include those substances that are not produced by the endocrine glands but that have similar effects. (12 Dec 1998) |
| hormones, ectopic | Hormones released from neoplasms or cells outside the usual sources of hormones. Such hormones may be useful as tumour markers. (12 Dec 1998) |
| hormones, hormone substitutes, and hormone antagonists | A collective grouping for both naturally occurring and synthetic hormones, substitutes, and antagonists. (12 Dec 1998) |
| hormones, synthetic | Synthetic chemical compounds that mimic the activity of hormones produced in the body, but differ in structure from naturally occurring hormones. (12 Dec 1998) |
| sex hormones | Hormones having oestrogenic (female sex hormones) or androgenic (male sex hormones) activity. (12 Dec 1998) |
| hypothalamic hormones | Hormones isolated from the hypothalamus which exercise control over other organs, primarily the pituitary gland. Well-known members include certain pituitary hormone-releasing hormones and pituitary hormone release inhibiting hormones. Vasopressin and oxytocin which are found in the posterior pituitary may also be secreted by the hypothalamus but are not grouped here (pituitary hormones, posterior). (12 Dec 1998) |
| steroid hormones | Those hormone's possessing the steroid ring system; e.g., androgens, oestrogens, adrenocortical hormone's. (05 Mar 2000) |
| neurohypophysial hormones | Hormones produced in the hypothalamus; e.g., oxytocin, vasopressin. (05 Mar 2000) |
| insect hormones | Hormones secreted by insects. They influence their growth and development. Also synthetic substances that act like insect hormones. (12 Dec 1998) |
| invertebrate hormones | Hormones produced by invertebrates, usually insects, mollusks, annelids, and helminths. (12 Dec 1998) |
| testicular hormones | Hormones produced in the testis. (12 Dec 1998) |
| thymus hormones | Humoral factors secreted by the thymus gland. They participate in the development of the lymphoid system and the maturation of the cellular immune response. (12 Dec 1998) |
| 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) |