What are the cells making up the gastric glands of the stomach?
Four different types of cells make up the gastric glands:
- Mucous cells.
- Parietal cells.
- Chief cells.
- Endocrine cells.
What are the things secreted from the stomach?
The stomach secretes water, electrolytes, hydrochloric acid, and glycoproteins, including mucin, intrinsic factor, and enzymes (Fig. 24.3). Gastric motility and secretion are regulated by neural and humoral mechanisms.
What will happen to the damaged and lost cells?
Toxic damage to cells can cause individual cell death and if sufficient cells are lost, the result can be tissue or organ failure, ultimately leading to death of the organism.
What organelle is the stomach of the cell?
Lysosomes
Lysosomes are organelles that contain digestive enzymes. They digest excess or worn out organelles, food particles, and engulfed viruses or bacteria. Lysosomes are like the stomach of the cell.
What are the three types of cells in the stomach?
The intermediate gastric glands produce most of the digestive substances secreted by the stomach. These glands are narrow tubules composed of three major cell types: zymogenic, parietal, and mucous neck cells.
What are gastric cells?
G cells – They secrete gastrin hormone. Gastrin stimulates the gastric glands to release gastric juice. These cells are mostly found in pyloric glands in the antrum of the pylorus; some are found in the duodenum and other tissues.
What are the three major types of cells found in gastric glands?
These glands are narrow tubules composed of three major cell types: zymogenic, parietal, and mucous neck cells. At the base of the gland are the zymogenic (chief) cells, which are thought to produce the enzymes pepsin and rennin.
What kind of secretions are produced by gastric glands?
Gastric juice is secreted by gastric mucosal glands, and contains hydrochloric acid, mucus, and proteolytic enzymes pepsin (which breaks down proteins), and lipase (which breaks down fats).
What do chief cells secrete?
pepsinogen
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.
How do proteins repair damaged cells?
The muscle damage initiates a repair process in which certain hormones, along with the macronutrient protein, synthesize new satellite cells, which are used to repair the damaged muscle fibers. In other words, the role of protein is to help repair tissues damaged by exercise.
What would likely happen to a cell in which the cell membrane was damaged or missing?
If the plasma membrane ruptures or breaks down, the cell will not be able to exchange material from its surroundings by diffusion or osmosis because it acts as a mechanical barrier. Thereafter, the protoplasmic material will be disappeared, and the cell will die.
What happens to microorganisms when cells are sloughed off?
As the cells are sloughed off, any microorganisms attached to these cells or within these cells enter the internal chyme and are excreted from the body. If the sloughing process is interfered with, microorganisms more easily form foci of infection.
What are the secretory cells of the stomach?
The much larger glands of the fundus and body of the stomach, the site of most chemical digestion, produce most of the gastric secretions. These glands are made up of a variety of secretory cells. These include parietal cells, chief cells, mucous neck cells, and enteroendocrine cells.
What happens when epithelial cells are sloughed off and replaced?
Under normal conditions epithelial cells are continually sloughed off and replaced. As the cells are sloughed off, any microorganisms attached to these cells or within these cells enter the internal chyme and are excreted from the body. If the sloughing process is interfered with, microorganisms more easily form foci of infection.
What is the function of the mucous membrane in the gut?
The mucous lubricates and forms a barrier which protects the mucosal epithelium from potentially noxious intraluminal substances. Goblet cell secretion of mucin is induced by enterotoxins of Escherichia coli and Vibrio cholerae as well as by immune complexes.