( Drugs and the nervous system )
Drugs are chemicals of synthetic origin , when industrially processed or natural , when taken in high concentrations from plant organs ( leaves ) , or secretion of substances from animal or fungal structures .
The continuous consumption , in addition to causing the death of the individual when in high amounts ( overdose ) may cause serious consequences in the nervous system ( neuronal damage ) , the circulatory ( arterial tension ) and respiratory problems as well as social, involving the marginalization teenagers attracted by trafficking .
Drugs can be classified according to the action : severe or mild , on the central nervous system :
Disturbing - those with hallucinogenic effect , accelerating brain function beyond normal, causing disturbances in the mind of the user . Example : LSD ( synthesized from lysergic acid ) , marijuana and hashish ( product and by-product derived from the plant Cannabis sativa ) , organic solvents ( glue sniffing ) .
Depressants ( the most dangerous ) - decrease brain activity , leaving the nerve stimuli slower . Example : tranquilizers produced by pharmaceutical companies ( antidepressants , sleeping pills and tranquilizers ) , opium , morphine and heroin ( derived from the poppy plant somniferum ) .
Stimulants - Substances that increase brain activity . Particularly stimulate sensory and motor areas . This group includes cocaine and its derivatives ( crack ) , extracted from the leaf of the coca plant , cocaine Erytroxylum .
Mixed drug - combinations of two or more effects . The most common and well known of this group is Ecstasy .
Therefore , regardless of their classification or the substance used , generates chemical dependency and cause serious damage to the body of the addicted person , irreversibly affecting the nervous system .
Krukemberghe Fonseca
Graduated in Biology
Team Brazil School
Source : http://www.brasilescola.com/biologia/a-classificacao-das-drogas.htm
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