Q. Which of the following hormones are not released in the duodenum?
a) Gastrin
b) Motilin
c) Somatostatin
d) Pancreatic YY
Correct Answer: d) Pancreatic YY
- Gastrin – secreted mainly by G-cells in the stomach, and in small amounts from the duodenum.
- Motilin – secreted by M cells in the duodenum and jejunum.
- Somatostatin – secreted by D-cells throughout the GI tract, including the duodenum.
- Pancreatic YY (PYY) – secreted by L-cells in the ileum and colon, not in the duodenum.
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