A hormone called _ controls the secretion of gastric juice.

Explanation

Option A: The hormone that controls the secretion of gastric juice is called gastrin. Gastrin is produced by special cells in the stomach called G cells. It plays a key role in stimulating the release of gastric acid, which is important for digestion and the breakdown of food in the stomach. Gastrin is released in response to various stimuli, such as the presence of food in the stomach or the stretching of the stomach wall. Option B: Secretin is a hormone that controls the secretion of pancreatic juice. It is produced by S cells in the duodenum. Secretin stimulates the secretion of bicarbonate ions by pancreatic duct cells. Bicarbonate ions neutralize the acidic contents of the stomach, which helps to protect the small intestine from damage. Option C and D: Thyroxine and iodothyronine are hormones that control metabolism. They are produced by the thyroid gland. Option E: Parathormone is a hormone produced by the parathyroid glands. It controls calcium levels in the blood. It does not have a direct effect on the secretion of gastric juice.