Metabotropic receptors
a. contain binding sites that are directly connected to a voltage-gated ion channel.
b. initiate a very rapid effect in response to neurotransmitter binding.
c. initiate a cascade of events, the effects of which can last indefinitely.
d. are stimulated only by neuromodulators, not by neurotransmitters.
e. are found only at axoaxonic synapses.
Answer: C
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