What are secretions of gastric glands and their roles?
The gastric gland is an essential body component because it secretes gastric juice. The gastric juice contains hydrochloric acid, pepsin and mucus. Pepsin helps in digestion of proteins, hydrochloric acid helps in the functionality of pepsin and kills bacteria and mucus protects the inner lining of the stomach.
What is the role of three types of 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. (Pepsin digests proteins, and rennin curdles milk.)
What are the secretions of gastric glands?
The various cells of the glands secrete mucus, pepsinogen, hydrochloric acid, intrinsic factor, gastrin, and bicarbonate.
What are the three major types of cells found in the gastric glands name their secretions?
The three major types of cells found in the gastric glands with their secretions are as follows: i. Mucous Neck cells – they secrete mucus ii. Peptic or chief cells – they secrete Proenzyme Pepsinogen and Prorennin iii. Parietal or oxyntic cells – they secrete HCl and intrinsic factor.
What is the role of gastric acid?
Gastric juice is a unique combination of hydrochloric acid (HCl), lipase, and pepsin. Its main function is to inactivate swallowed microorganisms, thereby inhibiting infectious agents from reaching the intestine.
What do neck cells secrete?
The mucous cells located deeper in the isthmus and neck of the GGs secrete a more acidic mucin substance and have a rounded nuclei with apical secretory granules. These mucous neck cells (MNs) are the anchored pluripotent stem cells that divide to replace all other cell types in the gastric gland.
What are the secretion of parietal cells?
The parietal cells are located in the middle part of the glands of the fundus-body region of the stomach. They secrete gastric acid, i.e. hydrochloric acid (approximately 0.16 M, pH ≥ 0.8) and secrete the intrinsic factor, which is a vitamin B12-binding protein.