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____ is a hormone secreted by an empty stomach; it sends the "i am hungry" signal to the brain.

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Answer:Ghrelin.

Ghrelin is known to be the "hunger hormone" because it's secreted by ghrelinergic cells in the gastrointestinal tract. When the stomach is empty this hormone is secreted and when the gastric walls stretch, because of the food inside, it stops being released.


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User Caoglish
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