Question

What are the various enzymatic types of glandular secretions in our gut helping digestion of food? What is the nature of end products obtained after complete digestion of food?

Answer 1

Glandular secretions :

The various enzymatic types of glandular secretion in the gut include:
● Saliva
● Gastric juice
● Pancreatic juice
● Succus entericus

Saliva :

Saliva from the salivary glands contains water, mucus, salivary amylase (ptyalin), ions, IgA etc.

Gastric juice :

Gastric juice from the gastric glands contains \(HCl\), intrinsic factor, pepsinogen, prorenin, mucus, and small amounts of gastric lipases.

Pancreatic juice :

Pancreatic juice from the pancreas contains amylase, lipase, nuclease, trypsinogen, chymotrypsinogen and procarboxypeptidase.

Succus entericus :

Succus entricus from the intestinal glands contains dipeptidase, maltase, sucrase, lipase, nucleotidase, nucleosidase, lactase.

End products :

The nature of end products obtained after complete digestion of food is as follows:-

● Amino acids
● Glucose
● Fructose
● Nitrogenous bases
● Fatty acids and glycerols

Digestion and end products :

Complex nutrient	Location of digestion	Enzymes involved	Final end product
Carbohydrate	Mouth	Amylase
	Duodenum	Pancreatic amylase
	Ileum	Maltases, lactases, sucrases	Monosaccharides
Proteins	Stomach	Pepsin, renin
	Duodenum	Trypsin, chymotrypsin, carboxypeptidase
	Ileum	Dipeptidases	Amino acids
Lipids	Duodenum	Pancreatic lipase Intestinal lipase	Fatty acids and glycerol
Nucleic acids	Duodenum	Nucleases
	Ileum	Nucleotidases, nucleosidases	Sugars and bases