Gastric acid Gastric acid Gastric acid, gastric juice or stomach acid, is a digestive fluid formed in the stomach and is composed of hydrochloric acid (HCl), potassium chloride (KCl) and sodium chloride (NaCl). The acid plays a key role in digestion of proteins, by activating digestive enzymes, and making ingested proteins unravel so that digestive enzymes break down the long chains of amino acids. Gastric acid is produced by cells in the lining of the stomach, which are coupled in feedback systems to increase acid production when needed. Other cells in the stomach produce bicarbonate, a base, to buffer the fluid, ensuring
Break key scancodes at all on release; therefore it is not possible for any software to determine whether this key is being held down. On modern keyboards, the key is usually labeled "Pause" with "Break" below, sometimes separated by a line: formula_1, or "Pause" on the top of the keycap and "Break" on the front. In most Windows environments, the key combination brings up the system properties. Compact and notebook keyboards often do not have a dedicated key. These may use the following substitutes for : Substitutes for : Apple keyboards do not have the Pause/Break key, as Mac OS X does