Caffeine produces its mentally stimulating effects, in part, by blocking _____ receptors in the brain.
A) norepinephrine
B) melatonin
C) dopamine
D) adenosine

Question

Quizplus · Accepted Answer

Caffeine blocks adenosine receptors in the brain, which normally bind to adenosine and promote feelings of fatigue and sleepiness. By blocking these receptors, caffeine can temporarily increase alertness and mental energy.

Caffeine Produces Its Mentally Stimulating Effects, in Part, by Blocking