A steroid is a lipid characterized by a carbon skeleton with four fused rings. All steroids are derived from the acetyl CoA biosynthetic pathway. Different steroids vary in the functional groups attached to these rings. Hundreds of distinct steroids have been identified in plants, animals, and fungi. Their most important role in most living systems is as hormones. Steroid hormones produce their physiological effects by binding to steroid hormone receptor proteins. The binding of steroid hormones to their receptors causes changes in gene transcription and cell function.
In human physiology and medicine, the most important steroids are cholesterol, the steroid hormones, and their precursors and metabolites. In the bloodstream steroids are bound to carrier proteins.
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Anabolic Steroid Abuse - Scientific research about the effects of steroids, abuse and addiction from the National Institute on Drug Abuse (NIDA).
Meta Description: [ The mission of the National Institute on Drug Abuse (NIDA) is to lead the Nation bringing the power of science to bear on drug abuse and addiction. ]
Anti-Doping - In English, Spanish, and French, a look at banned substances, why people do steroids, signs that someone is abusing, how they are used, effects, and other drugs that athletes can abuse. From the Junior Tennis League of the International Tennis Foundation.
Meta Description: [ The website of the International Tennis Federation, the world governing body of tennis - information on all aspects of tennis including players, records, rules and events such as Davis Cup and Fed Cup. ]
CBC Radio: The Price of 'roid Rage' - Tells the story of a former boxer whose steroid use led to the amputation of his legs. Includes audio clip and facts about his boxing career.
Meta Description: [ Bob Hazelton lost a fight to George Foreman. Then he lost his legs, and nearly his mind, to steroids. ]
If Looks Could Kill - A webquest challenging students to investigate steroids and creatine.
Introduction to Steroids - An eighth grader's report on steroids, including sections on how and why they're used, side effects, statistics, and a bibliography.
Steroids - Made by a biology student. Includes vocabulary, effects, why people use steroids, and mistakes made by steroid abusers.
Steroids - Part of a Thinkquest site, detailing athletes who have gotten caught using steroids to enhance performance, and other stories.
Steroids, Sports and Athletic Performance - What they are, what they do, effects on behavior, and getting help.
Taylor Hooton Foundation - Raising awareness about the dangers of steroid abuse, with facts, newsletter and list of speaking engagements.
Meta Description: [ The mission of the Taylor Hooton Foundation (THF) is to raise awareness among the general population of the United States about the dangers of anabolic steroid abuse. ]
TeensHealth: Are Steroids Worth the Risk? - Explains what they are, whether they work, dangers for boys and girls, and healthy alternatives.
Meta Description: [ Will using steroids transform you into the most powerful athlete your coach has ever seen? Read this article to learn the facts on steroid use. ]
What Steroids Can Do to You - Includes an overview of the history of steroid abuse in the athletics circles, side effects, and links to other sites offering steroid abuse information.
Meta Description: [ Steroid use and young adults. ]
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