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.
Effects and dangers of heroin. Heroin is a central nervous system depressant. In the brain, it is converted into morphine, which then binds to the receptors for the opiates that the body produces naturally. These receptors are located in the brain, the spinal cord, and certain internal organs.ffects and dangers of heroin. Heroin is a central nervous system depressant. In the brain, it is converted into morphine, which then binds to the receptors for the opiates that the body produces naturally. These receptors are located in the brain, the spinal cord, and certain internal organs.