Nokea
The structure which prevents entry of food into wind pipe during swallowing in mammals is-
- A. Larynx
- B. Glottis
- C. Epiglottis
- D. Pharynx
Correct Answer: C
Rationale: The epiglottis closes over the glottis during swallowing to prevent food from entering the trachea.
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Micelle formation is necessary for the intestinal absorption of
- A. Galactose
- B. Vitamin B12
- C. Vitamin D
- D. Bile salts
Correct Answer: C
Rationale: Micelles, formed by bile salts, facilitate the absorption of fat-soluble vitamins like vitamin D in the small intestine.
Cardiac glands of stomach, all true except:
- A. Present in the narrow band 10-40 mm wide around the esophageal orifice
- B. Lined by secreting cells that secrete mucous and few lysozymes
- C. Few parietal cells for HCL secretion and some enteroendocrine cells that secrete gastrin.
- D. Pits are relatively deep, occupying one half of the thickness of the mucosa
Correct Answer: D
Rationale: Cardiac gland pits are shallow, not deep, occupying less than half the mucosal thickness, unlike fundic glands.
If an incision had to be made in the small intestine to remove an obstruction, which tunica would be cut first?
- A. muscularis
- B. mucosa
- C. submucosa
- D. serosa
Correct Answer: D
Rationale: The serosa is the outermost layer of the small intestine and would be the first layer cut during surgery.
Succus entericus is secreted by-
- A. Gastric glands
- B. Islets of Langerhans
- C. Crypts of Lieberkuhn & Brunner's gland
- D. Goblet cells
Correct Answer: C
Rationale: Succus entericus is secreted by Crypts of Lieberkuhn and Brunner's glands.
Lipase is the enzyme that catalyses the breakdown of triacylglycerol into:
- A. Amino acids
- B. Lipids
- C. Fatty acids and glycerol
- D. Simple sugars
Correct Answer: C
Rationale: Lipase breaks down triacylglycerols into fatty acids and glycerol, aiding in the digestion and absorption of fats.