which substance functions to control the release of hydrochloric acid to prevent excessive acidity?

Solution:

A compound consisting of hydrogen and chlorine. Hydrochloric acid is secreted in the stomach and is a major component of gastric juice. A clear, colorless, fuming, poisonous, highly acidic aqueous solution of hydrogen chloride, HCl,it is a chemical intermediate used in, food processing, pickling, and metal cleaning. It is found in the stomach in dilute form. HCI is Hydrogen (H), Carbon (C) and Iodine (I). Although,  

HCI is not balanced, so, that would actually be an ion, with negative charge.a hormone that stimulates secretion of gastric juice, and is secreted into the bloodstream by the stomach wall in response to the presence of food.

thus for controlling  Gastrin is used.

Gastrin is a peptide hormone that stimulates secretion of gastric juice (HCl) by the partial cell of the stomach and aids in gastric motility. It is released by G cells in the pyloric antrum of the stomach.

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

hope it