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Drugs are chemical
substances that affect the
central nervous system,
causing psychological
changes and possible
addiction.…read more

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Painkillers deaden pain or affect
the way we think about it.
They block the receptor sites on
the postsynaptic membrane, as
painkillers have a complementary
shape, therefore, no impulses can
pass. This means that no sensation
Painkillers
can be felt.
Examples:
Paracetamol: a weak/mild
painkiller
Morphine: a prescription-only
painkiller that is very
strong. It is produced from
opium (found in poppy plants)
and its narcotic effects cause
drowsiness.…read more

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Hallucinogens produce
sensations of false
reality (hallucinations)
and cause changes in
psychological behaviour.
They alter the pathway
Hallucinogens
that electrical impulses
travel down.
Examples:
Lysergic Acid
Diethylamide (LSD)
Cannabis (Marijuana)
MDMA (Ecstasy)…read more

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Stimulants speed up
reflexes/decrease reaction
time.
They bind to the presynaptic
membrane and allow for the
Stimulants
release of more
neurotransmitters at one time.
Examples:
Nicotine
Caffeine: non-prescription,
legal drug found in
chocolate, tea, coffee and
cola.…read more

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