Q19. Which cells in the duodenum secrete cholecystokinin?a) chief cells b) parietal cells c) enteroendocrine cellsd) goblet cell

Break Down the Problem

1. Identify the Function of Cholecystokinin (CCK): Understand what cells are responsible for secreting CCK.
2. Examine Cell Types in the Duodenum: Explore the function and nature of each cell type mentioned in the options.

Relevant Concepts

• Cholecystokinin (CCK): It is a hormone that stimulates gallbladder contraction and secretion of pancreatic enzymes.
• Cell Types in the Duodenum:
  • Chief Cells: Secrete pepsinogen, primarily found in the stomach.
  • Parietal Cells: Secrete hydrochloric acid (HCl), also primarily found in the stomach.
  • Enteroendocrine Cells: Specialized cells in the digestive tract that secrete hormones including CCK.
  • Goblet Cells: Secrete mucus to protect the intestinal lining.

Analysis and Detail

• Enteroendocrine Cells: These cells are located in the mucosal lining of the duodenum and are responsible for producing and secreting various hormones, including cholecystokinin in response to the presence of fats and proteins in the stomach.

Verify and Summarize

After reviewing the roles of each cell type, it is clear that enteroendocrine cells are the correct answer since they specifically secrete cholecystokinin in the duodenum.

Final Answer

c) enteroendocrine cells