Caffeine is a stimulant drug that increases the activity of neurons and other cells by ___________.
A)increasing GABA activity
B)reducing adenosine activity
C)serving as an agonist for the transmitter adenosine
D)serving as an antagonist for the transmitter GABA

Question

Quizplus · Accepted Answer

Caffeine works primarily by blocking the action of adenosine on its receptors, which prevents the onset of drowsiness induced by adenosine. This reduction in adenosine activity leads to increased neuron firing and the release of other neurotransmitters like dopamine and norepinephrine, which stimulate the brain.

Caffeine Is a Stimulant Drug That Increases the Activity of Neurons