Hormones spread through the blood throughout the body, yet why do they affect only target organs?
Answer and explanation
Correct answer: Because target cells have specific receptors for them
The governing concept is receptor specificity in endocrine signalling. Blood carries a hormone widely, but a response occurs only when the hormone can bind to a matching receptor on or inside a target cell. This binding starts the appropriate cellular reaction, making option A correct. Other cells generally also receive blood; hormones are not restricted to the eye and are not normally destroyed simply by light. Therefore B, C, and D do not explain target-organ specificity.
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What is the correct answer to this question?
Because target cells have specific receptors for them
Why is this the correct answer?
The governing concept is receptor specificity in endocrine signalling. Blood carries a hormone widely, but a response occurs only when the hormone can bind to a matching receptor on or inside a target cell. This binding starts the appropriate cellular reaction, making option A correct. Other cells generally also receive blood; hormones are not restricted to the eye and are not normally destroyed simply by light. Therefore B, C, and D do not explain target-organ specificity.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: The Human Eye and the Colourful World. Topic: Dispersion of light.
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