Q. Which of the following hormones are not released in duodenum?
a) Gastrin
b) Motilin
c) Somatostatin
d) Pancreatic YY
Correct answer: d) Pancreatic YY
Here's the site of secretion for each hormone:
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Gastrin – secreted mainly by G-cells in the antrum of the stomach, but also in small amounts in the duodenum.
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Motilin – secreted by M cells of the duodenum and jejunum.
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Somatostatin – secreted by D-cells throughout the GI tract, including the duodenum.
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Pancreatic Polypeptide (PPY or PYY) – secreted mainly by L-cells in the ileum and colon, not the duodenum.
