After his third helping of apple pie and ice cream, Nathan feels quite full. His satiation is due, at least in part, to increased levels of the:
A) hormone epinephrine.
B) hormone ghrelin.
C) hormone cholecystokinin.
D) neurotransmitter neuropeptide Y.

Question

Quizplus · Accepted Answer

Cholecystokinin is a hormone released by the small intestine in response to food intake, particularly fat and protein. It signals the brain to reduce hunger and increase feelings of fullness, contributing to satiation and meal termination.

Answer: D
 Neuropeptide Y is a neurotransmitter that stimulates appetite and feeding behavior. It is released in response to low energy intake or fasting, and can lead to overeating and weight gain if its levels remain high. However, it is not responsible for the satiation and fullness that Nathan feels after eating.

After His Third Helping of Apple Pie and Ice Cream