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Consider the following statements (A-D) regarding the human digestive system.
(A) The stomach stores food for 4-5 hours.
(B) Food undergoes thorough mixing with acidic intestinal juice.
(C) Enterogastrone, an enzyme secreted by the intestinal mucosa, activates trypsinogen.
(D) Renin, an enzyme present in gastric juice, aids in the digestion of milk protein in infants.
How many of the above statements are correct?
Four
Three
Two
One
Answers (1)
Option 4, "one," is the correct answer.
(A) The statement that the stomach stores food for 4-5 hours is incorrect. The stomach primarily functions to mix and break down food through mechanical and chemical processes. Food typically remains in the stomach for about 2-4 hours, rather than 4-5 hours.
(B) The statement that food undergoes thorough mixing with acidic intestinal juice is incorrect. Intestinal juice is alkaline and helps neutralize the acidic chyme that enters the small intestine from the stomach. The mixing of food with intestinal juice occurs in the small intestine, not in the stomach.
(C) The statement that enterogastrone, an enzyme secreted by the intestinal mucosa, activates trypsinogen is correct. However, it is important to note that enterogastrone primarily inhibits gastric motility and secretion, rather than directly activating trypsinogen. The activation of trypsinogen into its active form, trypsin, is mediated by an enzyme called enterokinase, which is secreted by the brush border cells of the small intestine.
(D) The statement that renin, an enzyme present in gastric juice, aids in the digestion of milk protein in infants is incorrect. Renin is primarily produced and released by specialized cells called juxtaglomerular (JG) cells, which are located in the kidney. Renin plays a crucial role in regulating blood pressure and fluid balance through the renin-angiotensin-aldosterone system. However, Rennin is an enzyme produced by the gastric mucosa in infants that plays a role in the digestion of milk protein, particularly casein. Therefore, out of four statements, only one is correct and hence making option 4 the correct answer.
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