Despite the fact that in most countries drug use is prohibited, this does not mean that people do not accept them. Moreover, the two most dangerous drugs — alcohol and tobacco can be acquired in almost any country. Today for anybody not a secret that drugs are addictive. It is partly for this reason, they are outlawed. But what is the impact on the most complex organ of the human body have different chemical compounds?
Cheating the reward system
Since, like a drug first enters the brain is undergoing important changes in its chemistry and structure. Search fun is one of the strongest instincts of Homo Sapiens. When we do something pleasurable, the brain strengthens connections to find out what has to be done again to obtain fun. These connections, called the reward system extends from the brain stem across the limbic (emotional system) to the frontal cortex. Neurotransmitters are chemicals that the brain uses to transmit information and the communication of one neuron with others. The neurotransmitter dopamine is mainly involved in the reward system. Drugs alter the chemical functioning of the brain, giving it a much more dopamine than usual is produced.
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This has the following consequences:
The brain tries to adapt to the excessive stimulation of dopamine, which can destroy neurons, reducing the number of dopamine receptors. This leads to tolerance or the need to increase the dose obtained drugs: the brain will need more and more drug to achieve the same effect as the first time. But more important are the consequences in behavior: actions that once were enjoyable, will gradually cease to bring pleasure, becoming boring and not motivating. To fill the existing void will only be able drugs. As soon as the brain adapts to the presence of the drug, other neural connections in the brain will also be affected and undergo changes. The first and most closely associated with reward is our ability to remember information and learn new skills. It is these neural connections are responsible for the formation of habits and addictions.
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In the future, everything connected with the receipt and use of the drug will be strongly perceived by the brain as automatic, unconscious, compulsive action. This behavior can last for many years. In addition, changes will gradually occur in areas of the brain, which is necessary for reasoning, decision-making and control of behavior. Effects of changes in the frontal lobe are particularly negative for adolescents who have these parts of the brain are actively developing. Therefore, the use of narcotic substances at a young age interferes with the normal development of the organism.