Tag: organs systems in animals

A (Hepatic lobule) matches 3 (Glisson's capsule). B (Brunner's glands) matches 1 (Submucosa glands). C (Crypts of Lieberkuhn) matches 2 (Base of villi). D (Sphincter of Oddi) matches 5 (Hepatopancreatic duct). E (Cystic duct) matches 4 (Gallbladder).

Transverse rugae (palatine rugae) are ridges of the mucous membrane located on the hard palate, which assist in food manipulation.

Rennin (chymosin) is an enzyme that helps in the digestion of milk proteins. It is found in the gastric juice of young mammals (like calves) and human infants to digest milk, but its production decreases significantly in human adults.

Rennin is an enzyme primarily found in the gastric juice of infant mammals to coagulate milk. In adult humans, rennin is typically absent or present in negligible amounts.

Rennin is the specific gastric enzyme in infant mammals that converts soluble caseinogen into insoluble casein, which is then digested by pepsin.

Zymogen cells, also known as chief cells or peptic cells, are located in the gastric glands and are responsible for secreting pepsinogen, the inactive precursor to pepsin.

Pepsin is a protease that requires a low pH environment, provided by hydrochloric acid in the stomach, to become active and function optimally.

Gastric acid secretion is stimulated by multiple pathways: gastrin (hormonal), histamine (paracrine), and vagal activation (neural). Therefore, all these factors contribute to the process.

Chief cells (or zymogen cells) are the primary source of pepsinogen secretion in the gastric glands of the stomach.

Liquids, especially those like beer or water, pass through the stomach much faster than solid foods like proteins, carbohydrates, or fats, which require significant mechanical and chemical breakdown.