drugs

• what do drugs effect that cause side effects

  synapses
• where does a psychoactive drug act


  on the CNS which alters brain function
• give examples of psychoactive drugs

  tobacco , cannabis , ecstasy ,cocaine and heroin
• what can drugs cause changes in

  perception , mood ,consciousness and behaviour
• what are the two types of drugs

  excitatory and inhibitory
• what do excitatory drugs do


  they increase the frequency of action potential at the postsynaptic membrane
• what do inhibitory drugs do


  these decrease the frequency of action potential at the post synaptic membrane
• what are the effects of psychoactive drugs


  changes to subconscious , euphoria , increased alertness changes in perception ,mood and behaviour
• what do excitatory drugs do to have their effects on the body


  prevent the breakdown of neurotransmitters, prevent the uptake of neurotransmitters back into the axon terminal, increase the numbers of receptors int he postsynaptic membrane
• what do inhibatory drugs do to have their effects on the body


  prevents calcium ions back into the pre-synaptic knob, prevent exocytosis and therefore preventing release of neurotransmitters into the synaptic cleft ,bind to receptors on the post synaptic membrane
• what is an organophosphate


  this is an insecticide that cause uncontrollable muscle contractions on the insect
• why does organophosphate cause uncontrollable muscle contractions


  it inhibits acetylcholinesterase which cause the repeat firing of the post synaptic neuron