First slide

Mechanism of Hormone Action

Question

In the mechanism of action of a protein hormone, one of the secondary messengers is

Moderate

A

cyclic AMP
B

insulin
C

T₃
D

gastrin

Solution

cAMP is a secondary messenger.
Hormones which interact with membrane-bound receptors normally do not enter the target cell, but generate second messengers (e.g., cyclic AMP, IP₃, Ca⁺⁺,etc.) which in turn regulate cellular metabolism.
Insulin, gastrin and T₃ are hormones.

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