- 1 What is the function of chief cells in the digestive system?
- 2 What do the chief cells in the stomach secrete?
- 3 What are chief cells in the digestive system?
- 4 Where is the chief cells in the digestive system?
- 5 What are 4 cells of the stomach and their function?
- 6 What chemical digestion happens in the stomach?
- 7 What stomach cells secrete pepsinogen?
- 8 What prevents the stomach from digesting itself?
- 9 What are at least 3 functions of the stomach?
- 10 Are Chief cells located in gastric pits?
- 11 What are the 3 main hormones that regulate intestinal activity?
- 12 What are the major of Chief cells?
- 13 What kind of cells are in the stomach?
- 14 What is gastrin produced by?
What is the function of chief cells in the digestive system?
The primary function of gastric chief cells is the synthesis and release of the proenzyme pepsinogen, which subsequently, in an acid environment, is converted to the acid protease pepsin.
What do the chief cells in the stomach secrete?
DIGESTION AND ABSORPTION The chief cells secrete pepsinogen, a moderately sized zymogen protein with a molecular weight of 40,400. Pepsin, an enzyme with a molecular weight of 32,700, is formed in the acidic environment of the stomach when pepsinogen loses its activation peptides.
What are chief cells in the digestive system?
The gastric chief cell (also known as a zymogenic cell or peptic cell) is a cell in the stomach that releases pepsinogen and chymosin. Pepsinogen is activated into the digestive enzyme pepsin when it comes in contact with hydrochloric acid produced by gastric parietal cells.
Where is the chief cells in the digestive system?
Gastric chief cells are generally located deep in the mucosal layer of the stomach lining. Chief cells release the zymogen (enzyme precursor) pepsinogen when stimulated by a variety of factors including cholinergic activity from the vagus nerve and acidic condition in the stomach.
What are 4 cells of the stomach and their function?
Four major types of secretory epithelial cells cover the surface of the stomach and extend down into gastric pits and glands: Mucous cells: secrete an alkaline mucus that protects the epithelium against shear stress and acid. Parietal cells: secrete hydrochloric acid. Chief cells: secrete pepsin, a proteolytic enzyme.
What chemical digestion happens in the stomach?
In your stomach, unique chief cells secrete digestive enzymes. One is pepsin, which breaks down proteins. Another is gastric lipase, which breaks down triglycerides. In your stomach, your body absorbs fat-soluble substances, such as aspirin and alcohol.
What stomach cells secrete pepsinogen?
Gastric chief cells secrete pepsin as an inactive zymogen called pepsinogen. Parietal cells within the stomach lining secrete hydrochloric acid that lowers the pH of the stomach. A low pH (1.5 to 2) activates pepsin.
What prevents the stomach from digesting itself?
Your stomach protects itself from being digested by its own enzymes, or burnt by the corrosive hydrochloric acid, by secreting sticky, neutralising mucus that clings to the stomach walls. If this layer becomes damaged in any way it can result in painful and unpleasant stomach ulcers.
What are at least 3 functions of the stomach?
The stomach has 3 main functions:
- temporary storage for food, which passes from the esophagus to the stomach where it is held for 2 hours or longer.
- mixing and breakdown of food by contraction and relaxation of the muscle layers in the stomach.
- digestion of food.
Are Chief cells located in gastric pits?
Chief cells, also called zymogenic cells as they produce lytic enzymes, are most prominent in the lower region of the gastric glands.
What are the 3 main hormones that regulate intestinal activity?
Gastrin, secretin, and cholecystokinin (CCK) were the first discovered gut hormones, and as of today, there are more than 50 gut hormone genes and a multitude of bioactive peptides, which makes the gut as the largest endocrine organ of the body.
What are the major of Chief cells?
Chief cells are responsible for secreting pepsinogen. They have basally located nuclei and a basophilic cytoplasm with abundant rough endoplasmic reticulum and many secretory granules that contain pepsinogen. These are secreted into the lumen of the gastric gland.
What kind of cells are in the stomach?
Four different types of cells make up the gastric glands:
- Mucous cells.
- Parietal cells.
- Chief cells.
- Endocrine cells.
What is gastrin produced by?
Gastrin is produced by cells, called G cells, in the stomach lining. When food enters the stomach, G cells trigger the release of gastrin in the blood. As blood levels of gastrin rise, the stomach releases acid (gastric acid) that helps break down and digest food.