Mr. Kennedy is a regular coffee drinker. He feels more "alert" after a cup in the morning. This can be explained by the "placebo effect" caffeine stimulating dopamine and adenosine caffeine inhibiting adenosine and dopamine caffeine stimulating epinephrine and adenosine caffeine stimulating serotonin and epinephrine caffeine stimulating epinephrine and inhibiting adenosine caffeine inhibiting adenosine and stimulating acetlycholine O

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