Progestins are a group of naturally occurring or synthetic steroid hormones. The three main endogenous estrogens are estradiol, estriol and estrone. The placenta produces a fairly large amount of estrogen as well. © 2003-2012 Princeton University, Farlex Inc.Sex hormone combinations are products that contain more than one sex hormone, either estrogen and progestin or estrogen and androgen.Įstrogens are a group of hormones that are synthesized mainly by the ovaries and a small amount is synthesized by the testes in males and by the adrenal cortex in both sexes. Fortunately, these diseases can usually be treated, either with hormones made artificially in laboratories or by operating on the affected gland.īased on WordNet 3.0, Farlex clipart collection. Too little insulin causes diabetes, too little estrogen weakens the bones of older women, and too much growth hormone causes people to grow without stopping. When the amounts of these or other hormones are abnormal, disease can result.
Some of the hormones released in the brain, known as endorphins, act as natural painkillers. Estrogen and testosterone control sexual development. Growth hormone, secreted by the pituitary gland, controls growth of the body.
Thyroid hormones regulate the rate of cell metabolism and affect many other processes, including reproduction. Insulin, secreted by the pancreas, regulates the absorption of sugars in the body. The variety of different functions hormones have is astounding.
Hormones are not found only in humans, but also in all other animals and plants. Specialized cells of the nervous system also produce hormones. A lot of hormones are produced in glands known as endocrine glands, such as the thyroid gland, pancreas, and ovaries, and travel from there through the bloodstream before arriving at their target sites of action. Did You Know? On the inside, humans are bathing in a sea of hormones, chemical compounds that regulate many essential activities in the body.
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