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