Question

what are the two \big\ categories of neurotransmitters?
agonist and reuptake
action and resting potential
agonist and antagonist
antagonist and threshold

Explanation:

Agonists mimic neurotransmitter effects, while antagonists block them; these are the two core functional categories of neurotransmitter-related agents. The other options refer to neural processes (action/resting potential, threshold) or a reabsorption mechanism (reuptake), not neurotransmitter categories.

Answer:

C. Agonist and Antagonist