試題詳解

28. Which of the following statement regarding neurotransmitter is correct? (1) A neurotransmitter can be re-uptaken back to the presynaptic neuron. (2) Gamma aminobutyric acid (GABA) is the principal inhibitory neurotransmitter in the brain. (3) The role of a neurotransmitter agonist is to mimic or enhance the effects of specific neurotransmitters.
(A) (1) and (2)
(B) (1) and (3)
(C) (2) and (3)
(D) all of the above
(E) none of the above