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From Wikipedia, the free encyclopedia. Gastrin is a peptide hormone that stimulates secretion of gastric acid (HCl) by the parietal cells of the stomach and aids in gastric motility. It is released by G cells in the pyloric antrum of the stomach, duodenum, and the pancreas.
Calcitonin. Calcitonin is produced by the C cells of the thyroid gland and is released when levels of calcium in the blood are increased. Its role is to decrease the amount of calcium in the blood. It has the opposite action to parathyroid hormone, which increases the amount of calcium in the blood when levels fall.hen calcium levels are high, more calcitonin is released from the gland. When calcium levels fall, the release of calcitonin also falls. Some other hormones play a role in the regulation of calcitonin. Somatostatin is a hormone which reduces the release of calcitonin, and gastrin promotes the release of calcitonin.