Caffeine is an antagonist and therefore it is an example of a drug that
A)inhibits the action of a neurotransmitter
B)increases the action of a neurotransmitter
C)makes it more difficult for neurotransmitters to be deactivated
D)mimics the action of a neurotransmitter by binding with and stimulating postsynaptic receptor sites

Question

Quizplus · Accepted Answer

Caffeine acts as an antagonist by inhibiting the action of the neurotransmitter adenosine, thereby preventing it from binding to its receptor and causing drowsiness.

Caffeine Is an Antagonist and Therefore It Is an Example