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Question
Illustrate the differences between the mechanism of action of a protein and a steroid hormone.
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Solution
| Protein hormone | Steroid hormone |
| Protein hormones are insulin, glucagon, prolactin etc. They have to bind their receptors which are present on the plasma membrane. They form their hormone receptor complex on the membrane. They are water-soluble hormones so they can’t diffuse to the lipid layer plasma membrane and bind to a receptor on the membrane. | Steroid hormone is an androgen, estrogen etc. which don’t have their receptor on the plasma membrane they directly diffuse to their target site. They don’t produce a secondary messenger. |
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