Question

current attempt in progress
the black widow spider has venom that causes muscle spasms (uncontrollable movements). it works by increasing the effects of a neurotransmitter called acetylcholine. therefore, the venom would be an example of a(n) ____ to acetylcholine.
psychoactive inhibitor
antagonist
agonist
protagonist

Explanation:

An agonist is a substance that binds to a receptor and activates it to produce a similar response to the endogenous ligand. Since the black widow spider venom increases the effects of acetyl - choline, it acts like an agonist to acetyl - choline. An antagonist blocks the action of a neurotransmitter, a psychoactive inhibitor reduces neural activity in a non - specific psychoactive way, and a protagonist is a term not related to neurotransmitter function in this context.

Answer:

C. agonist