Question

Which of the following is not true about the stomach in humans?

• A. Oesophagus opens in cardiac part of stomach.
• B. Pepsin is the proteolytic enzyme of stomach.
• C. Rennin is the proteolytic enzyme in gastric juice of infants.
• D. The secretion of gastric glands does not have lipases.

Answer 1

Answer: (D)

Food remains in the stomach for 4-5 hours. During this time, it mixes thoroughly with the acidic gastric juice by the churning movements of the muscular wall of the stomach and is now called the chyme.
Digestion in the stomach:
A. Proenzyme pepsinogen -----(HCl)---- $ \rightarrow $ Pepsin (active enzyme).
B. Proteins ------- (Pepsin, pH = 1.8) ---- $ \rightarrow $ Proteoses and peptones (peptides).
C. Rennin (a proteolytic enzyme in gastric juice of infants) helps in the digestion of milk proteins.
D. Lipases are also secreted in small amounts.