Like Y-DNA STRs, autosomal STRs are counts of repeated genetic code. As autosomal DNA recombines each generation, the number of markers shared with a specific ancestor is reduced by half each generation.
Heroin acts as a lipid soluble âprodrugâ within the brain, meaning that heroin itself is inactive but it is metabolized into an active form within the body. After crossing the blood-brain barrier, heroin is metabolized into morphine, which actively binds to opiate receptors in the brain producing the high.
Heroin Facts. Heroin is processed from morphine, a naturally occurring opiate extracted from the seedpod of certain varieties of poppy plants. The opium poppy has been cultivated for more than five thousand years for a variety of medicinal uses. Heroin was first synthesized from morphine in 1874. Mexican black tar heroin, however, is usually injected (once dissolved) or smoked because of its consistency. 2  Like other opiates, heroin is a sedative drug that slows body functioning. 3  People who use it describe a feeling of warmth, relaxation and detachment, with a lessening sense of anxiety.