Which hormone is orexigenic?

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Multiple Choice

Which hormone is orexigenic?

Orexigenic signals are those that stimulate hunger and increase food intake. Ghrelin fits this role because it is produced mainly in the stomach and acts on the hypothalamus to promote feeding, especially by activating neurons that release appetite-stimulating neuropeptides like neuropeptide Y. Its hunger signal rises before meals and falls after eating, reinforcing its role in driving intake. In contrast, leptin signals energy stores and suppresses appetite, PYY released after meals reduces hunger, and GLP-1 promotes satiety and also lowers food intake. So ghrelin is the one that increases appetite, making it the correct choice.

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