Word: adrenalineâ
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...neuroscientists. What they know is that caffeine binds to receptors that normally accept adenosine, a neurotransmitter that signals brain cells to quiet down their activity. Blocking adenosine staves off sleepiness. The resulting higher level of brain activity puts the nervous system on alert, triggering the release of adrenaline???the probable cause of caffeine's tendency to focus the mind...
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