The 'Hormone Gastrin' is secreted by the 'G cells' of the stomach and primarily stimulates:
A. The pancreas to secrete bicarbonate
B. The gall bladder to contract
C. The gastric glands to secrete hydrochloric acid (HCl) and pepsinogen
D. The liver to produce bile
Answer: Option C
Solution (By JKSSB Mock Tests)
Gastrin is a peptide hormone produced by the G cells (gastrin cells) located in the pyloric antrum of the stomach. Its primary function is to stimulate the parietal cells of the gastric glands to secrete hydrochloric acid (HCl) and the chief cells to secrete pepsinogen. This prepares the stomach for the digestion of food. Gastrin also stimulates gastric motility and growth of the gastric mucosa. Secretin and CCK stimulate the pancreas and gall bladder.
Explanation:
Chief (peptic) cells secrete pepsinogen, which is activated to pepsin by HCl. Parietal cells secrete HCl and intrinsic factor. Goblet cells secrete mucus.
Explanation:
Typhoid fever is caused by Salmonella typhi, transmitted through contaminated food and water. Widal test is used for diagnosis. Cholera is Vibrio cholerae.
Consider the following statements about blood:
1. Red blood cells transport oxygen.
2. White blood cells are involved in immunity.
3. Platelets help in blood clotting.
Which of the above is/are correct?
Explanation:
All three statements are correct: RBCs contain hemoglobin for oxygen transport, WBCs (leukocytes) defend against pathogens, and platelets (thrombocytes) initiate blood clotting.
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