Physiology When pH of stomach lumen falls below 4, antrum of the stomach releases a peptide that acts locally to inhibit gastrim release. This peptide is A Intrinsic factor B Secretin C Somatostatin D Gastrin 💡 Explanation When pH of stomach lumen falls below 4, antrum of the stomach releases a peptide that acts locally to inhibit gastrim release. This peptide is ✓ Correct Answer: C. Somatostatin