Name different types of cells present in gastric glands or Enlist cells of gastric glands with their secretion in man.
Gastric glands are composed of three kinds of cells:
- mucous cells, that secrete mucus
- parietal or oxyntic cells secrete hydrochloric acid
- zymogen ceils, which secrete pepsinogen
What is gastric juice? What is the composition / ingredients of gastric juice?
The secretion of different types of cells of gastric glands is collectively called gastric juice which contains mucus, hydrochloric acid and pepsinogen.
What is the function of hydrochloric acid released by gastric glands?
Hydrochloric acid is secreted in concentrated form. It adjusts the pH of stomach contents ranging from 2-3 for the pepsin to act on proteins. It also softens the food and kills many microorganisms taken in along with the food.
What is pepsin? or What is difference between pepsin and pepsinogen? or Give two ways by which pepsinogen is activated.
Pepsin is an enzyme secreted in an inactive form called pepsinogen. Pepsinogen is activated to pepsin when exposed to the acidic medium or to some already activated pepsin. Pepsin hydrolyzes protein to yield peptones and polypeptides.
What is chyme?
The muscles of stomach wall thoroughly mix up the food with gastric juice and eventually convert it to semi-solid mass called chyme.
What is the function of enzymes found in pancreatic juice? or Enlist enzymes secreted by pancreas. Give their functions. or Discuss role of trypsin in digestion.
- Amylase, also called amylopsin, digests starch into maltose
- Lipase hydrolyzes a small percentage of fats into fatty acids and glycerol
- Trypsin splits proteins into peptones and polypeptides