Question

question 9 (0.5 points)
which of the following statements correctly describes the role of cholecystokinin (cck) in response to fat in the duodenum?

cck is secreted in response to carbohydrates in the duodenum, leading to increased pancreatic enzyme release and decreased bile concentration.
cck is released in response to fat in the duodenum, stimulating the gallbladder to contract and release concentrated bile while also promoting the secretion of pancreatic enzymes.
cck primarily stimulates gastric motility in response to fat in the duodenum and inhibits pancreatic enzyme secretion.
cck is stimulated by protein in the duodenum and inhibits gallbladder contraction while increasing gastric acid secretion.

Explanation:

To solve this, we analyze each option:

• First option: CCK responds to fat (not carbohydrates) and increases bile concentration (not decreases), so incorrect.
• Second option: CCK is released by fat in duodenum, stimulates gallbladder contraction (releasing concentrated bile) and pancreatic enzyme secretion. This matches CCK's role.
• Third option: CCK inhibits gastric motility (not stimulates) and promotes pancreatic enzyme secretion (not inhibits), so incorrect.
• Fourth option: CCK is stimulated by fat/protein, stimulates gallbladder contraction (not inhibits) and decreases gastric acid secretion (not increases), so incorrect.

Answer:

B. CCK is released in response to fat in the duodenum, stimulating the gallbladder to contract and release concentrated bile while also promoting the secretion of pancreatic enzymes.