Ncert Exercises & Solutions

In the mechanism of action of a protein hormone, one of the second messengers is
1. Cyclic AMP
2. Insulin
3. T₃
4. Gastrin

(a) Cyclic AMP is one of the second messengers involved in the action of a protein hormone. The other three options are incorrect as

Insulin regulates glucose homeostasis.

T₃ regulates the metabolic rate of the body and thus, helps in maintaining Basal Metabolic Rate (BMR).

Gastrin is a peptide hormone, that stimulates the secretion of hydrochloric acid and pepsinogen.