Thomas recently ate dinner at home alone and is now going to the movies with a friend.His friend asks him if he is hungry,and Thomas answers "No." Which hormone is sending "I'm not hungry" signals to Thomas' brain?
A) ghrelin
B) PYY
C) insulin
D) leptin

Question

Quizplus · Accepted Answer

PYY (peptide YY) is a hormone produced by the small intestine after a meal. It sends signals to the brain to decrease hunger and increase satiety. Since Thomas recently ate dinner, it is likely that PYY is still present in his system and sending signals to his brain that he is not hungry. Ghrelin is a hormone that stimulates hunger, insulin regulates blood sugar levels, and leptin regulates energy balance and fat storage. None of these hormones would be responsible for Thomas feeling full after a meal.

Thomas Recently Ate Dinner at Home Alone and Is Now