Question

The gastric juice contains
A) Trypsin, pepsin, lipase
B) Pepsin, lipase, rennin
C) Pepsin, amylase, trypsin
D) Pepsin, rennin, carboxypeptidase

Answer 1

Hint:They help in metabolising proteins into peptones, helps in breaking the fats into fatty acids and are useful in milk coagulation. Present in an inert form that is activated by hydrochloric acid.

Complete answer:Gastric juice is a strongly acidic, colourless liquid that is secreted by the glands in the lining of the stomach. Gastric juice composed of hydrochloric acid, sodium chloride and potassium chloride. It plays an important role in digestion of proteins by activating digestive enzymes. The gastric juice has pepsin, lipase, and rennin. Renin is an enzyme that helps in digesting only milk proteins to peptides. Pepsin digests other proteins in the food to smaller peptides fragments. Lipase acts as butter fat that breaks fats into fatty acids. These are all digestive enzymes that take place in the stomach for the digestion process.

Additional information:Trypsin is protease of the digestive system that is produced in the pancreas. It is an inactive precursor that is secreted in the small intestine. Amylase produced by the salivary glands and pancreas that catalyses the hydrolysis of starch into sugars. Carboxypeptidase is produced in the pancreas and is important in digestion, blood clotting, reproduction.

Thus, the correct answer is option B. i.e., pepsin, lipase, rennin.

Note:Gastric juice acidifies the food and stops the action of salivary amylase. It kills ingested microbes and provides the acid environment needed for action of pepsins. The gastric juice is 97-99% of water.