AP BIOLOGY

Detailed explanation-1: -Pepsin is a stomach enzyme that serves to digest proteins found in ingested food. Gastric chief cells secrete pepsin as an inactive zymogen called pepsinogen.

Detailed explanation-2: -Pepsinogen is secreted from peptic (or chief) cells in the oxyntic gland. Some pepsinogen is also secreted from mucosal cells in the gastric antrum and the duodenum. In the presence of gastric acid this proenzyme is converted into active pepsin, which itself catalyzes further conversion from pepsinogen.

Detailed explanation-3: -Pepsinogen is the zymogen, or inactive precursor, of pepsin, the principal proteolytic enzyme of gastric juice.

Detailed explanation-4: -A substance made by cells in the stomach. Acid in the stomach changes pepsinogen to pepsin, which breaks down proteins in food during digestion.

Detailed explanation-5: -pepsin, the powerful enzyme in gastric juice that digests proteins such as those in meat, eggs, seeds, or dairy products. Pepsin is the mature active form of the zymogen (inactive protein) pepsinogen.