Describe & evaluate the effects of 2 drugs on the functioning of Essay

Describe & evaluate the effects of 2 drugs on the functioning of neurotransmitters - Essay Example It is four times stronger, than morphine. But the feeling, to which drug addicts strive, is just a side effect for medicine. This ‘side effect’ is displayed through better mood – euphoria, accompanied by the feeling of indifference to the environment, drowsiness, feeling of warmth, heaviness and relaxation in body and extremities. ‘Heroin – is the warmth, sweet warmth, which seems to be growing out of your body. At first it seems you are pregnant with this warmth, it is like a tender life under your skin, and this ‘live warmth’ fills your body with heaviness, the wish to move disappears together with all other wishes, the only wish is to lay and listen to this warmth†¦Ã¢â‚¬â„¢ (Carnwath 2002, p. 23) Fast and powerful effect of heroin on the nervous system is connected with the fact that it penetrates to it easier, than other drugs do. The thing is, that nature has created a special barrier for the protection of the main human organ – brain, and this barrier allows far not all substances to reach the nervous cells (in medicine this barrier is called ‘blood-brain barrier’). The structure of heroin’s molecule allows it to easily penetrate though this blood-brain barrier and quickly accumulate in brain. As soon as heroin appears in the brain, it as if ‘throws down’ its capsule and turns into morphine. It appears that the main difference of heroin from morphine is in its transport capsule, which allows it to instantly penetrate into the nervous system, causing the abundance of electromagnetic impulses. (Carnwath 2002, p. 49) The thing is that some parts of heroin’s molecules are similar to those of natural substances, produced by the nervous system – the so-called endorphins. In the normally working brain such substances work as delicate regulators of emotional and intellectual human activity. The content of these substances in the drug is much higher, than the nervous system needs for normal activity. And the main thing is that it is