Which of the following hormones stimulates the release of gastric acid?

Correct Answer: A

Rationale: The correct answer is A: gastrin. Gastrin is a hormone produced by G cells in the stomach lining that stimulates the release of gastric acid. It acts directly on parietal cells to increase acid secretion. Secretin (B) stimulates pancreatic bicarbonate secretion, not gastric acid. Insulin (C) regulates blood sugar levels, not gastric acid secretion. Cholecystokinin (D) stimulates the release of bile from the gallbladder and pancreatic enzymes, not gastric acid.

Correct Answer: B

Rationale: The correct answer is B: storing bile. The gallbladder functions to store bile produced by the liver and release it into the small intestine to aid in digestion. Bile helps in the breakdown of fats. Choices A, C, and D are incorrect because the gallbladder does not produce bile (the liver does), secrete digestive enzymes (pancreas does), or neutralize stomach acid (function of the stomach and duodenum).

Correct Answer: A

Rationale: The correct answer is A: Mouth. In the mouth, salivary amylase is secreted, which starts breaking down carbohydrates into simpler sugars like maltose. This initial breakdown of carbohydrates through the enzyme amylase marks the beginning of chemical digestion. The stomach primarily digests proteins, not carbohydrates (eliminating option B). The small intestine is where most of the carbohydrate digestion and absorption occurs, but the process begins in the mouth (eliminating option C). The large intestine is responsible for absorbing water and electrolytes, not carbohydrate digestion (eliminating option D).

Correct Answer: D

Rationale: The correct answer is D because bile pigments are not needed for micelle formation. Micelles are formed by bile salts, which aid in the emulsification of fats. Choice A is incorrect as bile is primarily produced by the liver, not bile duct cells. Choice B is incorrect as primary bile acids are stored in the gall bladder, not secondary bile acids. Choice C is incorrect as secretin stimulates the release of pancreatic enzymes, not bile secretion.

Correct Answer: B

Rationale: The correct answer is B: Failure of digestion and absorption of proteins. Atrophy of gastric mucosal glands leads to decreased production of hydrochloric acid and pepsin, essential for protein digestion. This results in impaired breakdown of proteins, leading to failure of digestion and absorption. Choice A is incorrect as starch digestion primarily occurs in the mouth and small intestine. Choice C is incorrect because high gastrin levels are associated with increased acid production. Choice D is incorrect as secretin is not directly involved in protein digestion.