Advanced Dental Admission Test (ADAT)

What hormone is released from G Cells in the stomach?

1. Secretin

2. Cholecystokinin

3. Gastrin

4. Gastric inhibitory peptide

The correct answer is: Gastrin

The hormone released from G cells in the stomach is gastrin, which is a key player in the digestive process. G cells, located primarily in the gastric mucosa, respond to various stimuli, such as the presence of food in the stomach, by secreting gastrin into the bloodstream. Gastrin has several vital functions: it stimulates the secretion of gastric acid (hydrochloric acid) from the parietal cells in the stomach, which is critical for the digestion of food. It also promotes gastric motility, enhancing the movement of the stomach muscles to facilitate digestion and mixing of food with gastric juices. Additionally, gastrin aids in maintaining the integrity of the gastric mucosa through its trophic effects. The other hormones listed have different sources and functions. Secretin is produced by the S cells in the duodenum and plays a role in regulating water homeostasis and acidity by stimulating the pancreas to release bicarbonate. Cholecystokinin, mostly produced in the cells of the small intestine, is involved in stimulating the gallbladder to release bile and promoting the release of digestive enzymes from the pancreas. Gastric inhibitory peptide (GIP) is also produced in the small intestine and helps to inhibit gastric motility and secretion