Same chapter3 marksDifficulty: Medium
Name the hormones of the adrenal cortex and the adrenal medulla and state one function of each group.
Chemical Coordination and Integration
3 marksDifficulty: Medium
Describe the mechanism of action of a protein hormone and of a steroid hormone.
Original Khojo Papers practice question — not from a past board paper.
Answer
A protein hormone cannot cross the plasma membrane, so it binds a receptor on the surface and acts through a second messenger such as cyclic AMP, which sets off a cascade inside the cell. A steroid hormone is lipid-soluble, passes through the membrane and binds a receptor inside the cell; the complex enters the nucleus and regulates the transcription of specific genes.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
This is why steroid hormones act more slowly but for longer.
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