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. Adenosine is a chemical in the brain that promotes sleep and suppresses arousal. By blocking adenosine receptors, caffeine increases alertness and mental arousal.

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