Match up the correct pairing of a receptor type with its action
A) ionotropic; direct opening of an ion channel
B) ionotropic; more time required to open an ion channel
C) ionotropic; G-protein activation leads to activation of a second messenger
D) metabotropic; second messenger effects that are specific to neuronal communication
E) metabotropic; rapid and short-lived effects on ion channels
Answer: A
Rationale: Activation of ionotropic receptor results in the direct opening of an ion channel.
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