Which of the following is TRUE regarding cholecystokinin (CCK)?
A)CCK promotes satiation by slowing the rate at which the stomach empties.
B)Blood levels of CCK are directly proportional to the amount of adipose tissue a person has.
C)Approximately 30 minutes before eating, blood levels of CCK decrease.
D)CCK promotes hunger by increasing the rate at which the stomach empties.

Question

Quizplus · Accepted Answer

Cholecystokinin (CCK) promotes satiation by slowing the rate at which the stomach empties. This hormone is released by the small intestine in response to the presence of fat and protein in the meal. As CCK levels increase, it signals the brain to reduce appetite and slow down the gastrointestinal (GI) motility, which prolongs the feeling of fullness and thus reduces overall food intake.

Option B is incorrect because blood levels of CCK are not directly proportional to the amount of adipose tissue (fat) a person has. In fact, individuals with obesity or excess body fat tend to have lower levels of CCK and may have impaired satiety signals.

Option C is also incorrect because shortly before eating, blood levels of CCK actually increase as a result of cephalic phase secretion. This refers to the anticipatory release of digestive hormones like CCK, ghrelin, and insulin in response to sensory cues like sight, smell, and taste of food.

Option D is clearly incorrect because the main role of CCK is to suppress hunger and reduce food intake, not promote it.

Which of the Following Is TRUE Regarding Cholecystokinin (CCK)