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Identify A, B and C in the diagrammatic representation of the mechanism of hormone action.

1. A = Protein hormone; B = Cyclic AMP; C = Hormone-receptor complex
2. A = Steroid hormone; B = Hormone-receptor complex; C = Protein
3. A = Protein hormone; B = Receptor C = Cyclic AMP
4. A = Steroid hormone; B = Receptor; C = Second messenger

Correct answer: A = Protein hormone; B = Receptor C = Cyclic AMP

Solution

Protein hormones cannot cross the lipid bilayer, so they bind to receptors on the cell membrane. This activates a second messenger system, commonly cyclic AMP, inside the cell.

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