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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.

Related tags

Target OrgansHormone ReceptorsEndocrine SignallingCell ResponseDispersion Of LightThe Human Eye And The Colourful WorldScienceClass 10 Mcq

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