Caffeine - Improves alertless & reaction time, An example of a stimulant is - caffeine & cocaine and it increases heart rate, A drug - affects the way the body works, Alcohol and barbiturates - are sedatives and they slow the nervous system down, Pain relief drugs - block impulses travelling to part of brain that deals with pain, Examples of pain relief drugs are - Heorin, morphine & ibuprofen,

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