Drug - any chamical that affects the way your body functions.
Legal drugs - carry risks of dependancy and damage > misused.
Parkinson's disease - progressive loss of neurones in part of the brain (produces chemical dopamine).
Symptoms - tremors, stiffness, slow movements etc.
Enzyme in synapse breaks down dopamine, continues > not enough to balance ACh > overall effect - extensive loss of dopamine in brain.
Drug treatments - increase dopamine in brain or oppose action of ACh.
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