Zusammenfassung der Ressource
Drugs
- Most drugs are chemical
substances that effect the CNS.
They cause changes in
psychological behaviour
- Beneficial
- medical
uses
- antibiotics, eg penicillin
- over the counter or prescription
- Rehabilitation
- harmful
- dangerous if
missused
- addiction-
physical need and
withdrawal
symptoms
- Tolerance- the body gets used to
having it so you need a high dose
to get an effect.
- Depressants
- Decrease the activity of the
brain which slows down the NS
causing slow reactions
- alcohol
- Stimulants
- increase the activity of the
brain by increasing the
amount of neurotransmitter
at some neurone synapses
- nicotine, caffine
- painkillers
- decrease by blocking the nerve
impulses to the brian.
- Narcotics like Morphine
- hallucinogens
- distort what's seen and heard by alerting the
pathways nerve impulses normally travel along.
- LSD
- smoking
- carbon monoxide combines with haemoglobin
in red blood cells meaning the blood carries
less oxygen
- contains carcinogens
like tar.
- 90% of lung cancers are
associated with smoking.
- Alcohol
- short term
- slows reactions
- blurred vision and lower inhibitions
leading to people doing things they
usually wouldn't
- Long term
- poisonous
- death of liver cells forming scar
tissue that starts to block blood
flow through the liver- this is called
cirrhosis.
- if the liver can't do it's normal
job of cleaning the blood,
dangerous substances damage
the body.
- brain damage
- plants can produce
chemicals to defend
themselves against
pathogens. some of
these chemicals are anti
bacterial
- humans use plant chemicals
- Tea tree is a large Australian shrub
that kills bacteria
- the indigenous people of Australia
used in traditional medicines