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Elizabeth has become a drug user for a long period. Her good friend believe that dependency has not a biological explanation as none of her friends will be addicts plus they do not encourage her to adopt drugs. Illustrate and evaluate one biological explanation of drug dependency that could be accustomed to understand Elizabeth's drug justification. Drug misuse causes significant changes to the neurotransmitter amounts in the brain, and specifically levels of dopamine and serotonin. As these chemical substances are both mixed up in brain incentive ‘circuits' (e. g. the mesolimbic pathway) drugs develop feeling of ‘euphoria'. Drugs could affect Elizabeth's brain in 2 different ways, as a depressant or a stimulating to normal activity and as a result Elizabeth's mood and behaviour can be affected. Elizabeth's drug habit can be the result of a significant change to the neurotransmitter action inside the brain. Several drugs decelerate activity inside the brain by causing transmission of neurotransmitter concept between neurone less effective. Consequently , this has to be substituted with drugs to operate normally. For instance , alcohol is one of these types' drugs that seem to increase the power of a great inhibitory neurotransmitter called GABA. This neurotransmitter usually slows down brain activity, but when alcoholic beverages is consumed it too much slows down mind communication. Once drugs affect Elizabeth's brain chemical, feedback trap in the head attempts to stop the underproduction of neurotransmitter levels. Elizabeth's brain may possibly try to give up this by simply reducing the amount of receptors sites and the sensitivity of key neurotransmitter in the brains ‘reward circuits'. On account of this action, many drug is needed to reach a similar level of arousal as fewer receptor sites are available. Elizabeth drug acquiring may be to the fact that she requirements the drug in order to truly feel normal and therefore develops physiological dependency. Consequently , in order for Elizabeth to avoid the withdrawal symptoms, for example...

22.08.2019

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