Final answer:
Different types of cells in the stomach secrete various enzymes and substances. Parietal cells secrete hydrochloric acid, which activates pepsin. Chief cells secrete pepsinogen, while mucous neck cells secrete mucus, and enteroendocrine cells secrete hormones.
Step-by-step explanation:
The gastric glands in the stomach secrete gastric juice. These glands are made up of different types of cells that secrete a variety of enzymes. The types of cells include:
- Parietal cells: secrete hydrochloric acid, which activates the protein-digesting enzyme pepsin.
- Chief cells: secrete pepsinogen, the inactive form of pepsin.
- Mucous neck cells: secrete mucus to protect the stomach lining.
- Enteroendocrine cells: secrete hormones, including gastrin, which stimulates acid secretion.