Most deceased donors are those who have been pronounced brain dead. Brain dead means the cessation of brain function, typically after receiving an injury either traumatic or pathological to the brain, or otherwise cutting off blood circulation to the brain drowning , suffocation , etc. Breathing is maintained via artificial sources , which, in turn, maintains heartbeat. Once brain death has been declared the person can be considered for organ donation. Criteria for brain death vary.
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Feminization biology There are also sex-specific side effects of AAS. Development of breast tissue in males, a condition called gynecomastia which is usually caused by high levels of circulating estradiol , may arise because of increased conversion of testosterone to estradiol by the enzyme aromatase. This side-effect is temporary; the size of the testicles usually returns to normal within a few weeks of discontinuing AAS use as normal production of sperm resumes. Virilization Female-specific side effects include increases in body hair , permanent deepening of the voice, enlarged clitoris , and temporary decreases in menstrual cycles. Alteration of fertility and ovarian cysts can also occur in females. The kidney damage in the bodybuilders has similarities to that seen in morbidly obese patients, but appears to be even more severe. Neuropsychiatric[ edit ] Addiction experts in psychiatry, chemistry, pharmacology, forensic science, epidemiology, and the police and legal services engaged in delphic analysis regarding 20 popular recreational drugs.