Definition of 'steroid'
Llewellyn W January 28, University of California — San Francisco. The history of the U. Oral administration is the most convenient. See anabolic steroid defined for kids. Holford, Patrick The Family Nutrition Workbook Unlike his predecessor , he has publicised the results of all drug tests and banned for life those who have taken anabolic steroids. In certain cases of severe addiction, patients have taken medicines to help treat symptoms of withdrawal.
Video: pronunciation of 'steroid'
The Sun To fill your system with anabolic steroids to win a race at least has the logic of greed to it. Other brain regions; feedback re regulated hormones and their actions. Steroids can be artificially introduced into the bodies of athletes to improve their strength. Adolf Windaus adrenal cortical steroid adrenal gland adrenocorticosteroid adrenosterone Aldactone aldosterone anabolic anabolic steroid anabolic steroids androgen androgenic hormone androsterone Aristocort Aristopak aromatase aromatase inhibitor batrachotoxin bile acid. The Sun I played when rumours of steroid abuse were rife.
These forms of hormones are lipids. They can pass through the cell membrane as they are fat-soluble,  and then bind to steroid hormone receptors which may be nuclear or cytosolic depending on the steroid hormone to bring about changes within the cell. Steroid hormones are generally carried in the blood, bound to specific carrier proteins such as sex hormone-binding globulin or corticosteroid-binding globulin.
Further conversions and catabolism occurs in the liver, in other "peripheral" tissues, and in the target tissues. A variety of synthetic steroids and sterols have also been contrived. Most are steroids, but some nonsteroidal molecules can interact with the steroid receptors because of a similarity of shape. Some synthetic steroids are weaker or stronger than the natural steroids whose receptors they activate.
Steroid hormones are transported through the blood by being bound to carrier proteins—serum proteins that bind them and increase the hormones' solubility in water. Some examples are sex hormone-binding globulin SHBG , corticosteroid-binding globulin , and albumin. In order to be active, steroid hormones must free themselves from their blood-solubilizing proteins and either bind to extracellular receptors, or passively cross the cell membrane and bind to nuclear receptors.
This idea is known as the free hormone hypothesis. This idea is shown in Figure 1 to the right. One study has found that these steroid-carrier complexes are bound by megalin , a membrane receptor, and are then taken into cells via endocytosis. One possible pathway is that once inside the cell these complexes are taken to the lysosome, where the carrier protein is degraded and the steroid hormone is released into the cytoplasm of the target cell.
The hormone then follows a genomic pathway of action. This process is shown in Figure 2 to the right. In order for steroid hormones to cross the lipid bilayer of cells they must overcome energetic barriers that would prevent their entering or exiting the membrane. Gibbs free energy is an important concept here.
These hormones, which are all derived from cholesterol, have hydrophilic functional groups at either end and hydrophobic carbon backbones. When steroid hormones are entering membranes free energy barriers exist when the functional groups are entering the hydrophobic interior of membrane, but it is energetically favorable for the hydrophobic core of these hormones to enter lipid bilayers. These energy barriers and wells are reversed for hormones exiting membranes.
Steroid hormones easily enter and exit the membrane at physiologic conditions. See anabolic steroid defined for kids. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'anabolic steroid. Encyclopedia article about anabolic steroid. What made you want to look up anabolic steroid? Please tell us where you read or heard it including the quote, if possible.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Test Your Knowledge - and learn some interesting things along the way. Roll up your sleeves. Around and around we go. Some people do not find it welcome. How we chose 'feminism'. How to use a word that literally drives some people nuts. The awkward case of 'his or her'. No, I'm really asking. Times, Sunday Times But if the steroid spray is working fine , you can carry on with that.
The Sun I played when rumours of steroid abuse were rife. Times, Sunday Times A pal spoke out to warn about the dangers of steroid abuse. The Sun The first consideration was whether this might be a case of excessive steroid abuse - but that was easily tested.
Times, Sunday Times In a sport in which power and strength play an increasing part, steroid abuse has been more common place. Times, Sunday Times Some people are tempted to take anabolic steroids to build their muscle mass , while others use them to improve performance. The Sun These are called steroid hormones. Holford, Patrick The Family Nutrition Workbook Unlike his predecessor , he has publicised the results of all drug tests and banned for life those who have taken anabolic steroids.
Times, Sunday Times Guys often stop me to ask about my fitness routine and if I take steroids. The Sun Continuing on our journey around the body, we will also meet cholesterol in the glands as it is the derivative of a number of steroid hormones. Times, Sunday Times The main effect that body builders want is a boost of muscle mass, and anabolic steroids help you get big , fast.
Times, Sunday Times Translate your text for free. Nearby words of 'steroid'.
Iamges: anabolic steroid hormone definition
Oral administration is the most convenient. It's not that we set out to target cops, but when we're in the middle of an active investigation into steroids, there have been quite a few cases that have led back to police officers," says Lawrence Payne, a spokesman for the United States Drug Enforcement Administration. The Journal of Adolescent Health.
How to use a word that literally drives some people nuts. Androvax androstenedione albumin Ovandrotone albumin Fecundin.
AAS are readily available without a prescription in some countries such as Mexico and Thailand. John Wiley and Sons. Anaboilc steroid injections play no anadrol 50 for sale usa in the management of chronic asthma, says an expert at the Ministry of Anabolic steroid hormone definition who believes that an inhaler device is the best medication. Development of breast tissue in males, a condition called gynecomastia which is usually caused by high levels of circulating estradiolmay arise because of increased conversion of testosterone to estradiol by the enzyme aromatase. The relationship between AAS use and depression anabolic steroid hormone definition inconclusive. Some anabolic steroids are given as appetite stimulants.
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