A possible explanation for the effect of caffeine is that it blocks the receptor for a neuromodulator in the brain called __________,which inhibits ACh release by cholinergic neurons.
A) glycine
B) dopamine
C) serotonin
D) melatonin
E) adenosine

Question

Quizplus · Accepted Answer

Adenosine is a neuromodulator that builds up in the brain over the course of the day and inhibits the release of acetylcholine (ACh) by cholinergic neurons. Caffeine is believed to work by blocking adenosine receptors, which reduces the inhibitory effect on ACh release.

A Possible Explanation for the Effect of Caffeine Is That