Caffeine mimics the effects of a natural brain chemical called:
A)adenosine.
B)acetylcholine.
C)adrenaline.
D)dopamine.

Question

Quizplus · Accepted Answer

Caffeine blocks the receptor sites for adenosine in the brain, which leads to increased alertness and arousal. Adenosine is a naturally occurring brain chemical that promotes sleep and suppresses arousal, so blocking its effects with caffeine has the opposite effect. Acetylcholine and adrenaline also play important roles in the brain and body, but caffeine does not mimic their effects in the same way. Dopamine is another neurotransmitter that is often associated with the effects of drugs, but it is not the natural brain chemical that caffeine mimics.

Caffeine Mimics the Effects of a Natural Brain Chemical Called