D Cells

The rare D-cells produce somatostatin. This hormone takes its name from a long-term effect: Somatostatin blocks the release of growth hormone from the pituitary gland and thus inhibits growth. In the short term it increases the blood sugar level, inhibits the motor function of the gastrointestinal tract and the gallbladder as well as the secretion of gastric and pancreatic juice. So it's a little stressful. It is also known today that somatostatin has a direct inhibitory effect on insulin and glucagon release. Figuratively speaking, it dynamizes these hormone levels.