A 20-year-old male college student has recently finished a Thanksgiving dinner of heroic proportions while home for the holiday weekend. Which of the following phenomena would most likely have produced his sensation of satiety?
A)
Stretch receptors in the stomach and small intestine signal the feeding center in the medulla.
B)
Increased levels of leptin stimulate a decrease in appetite by way of the vagus nerve.
C)
The breakdown of products of lipids such as ketoacids produces a decrease in appetite.
D)
Cholecystokinin and glucagon-like peptide-1 suppress the hunger impulse.
Ans:
D
Feedback:
The presence of fat in the duodenum and nutrients in the small bowel results in the release of cholecystokinin and glucagon-like peptide-1, respectively, which suppress the feeding center located in the hypothalamus. Leptin and ketoacids are associated with the intermediate and long-term regulation of food intake rather than the short-term control that would signal the end of a meal or snack.
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