Nokea
Why is pepsin not secreted into the stomach?
- A. Because it would digest the stomach
- B. It is secreted into the stomach
- C. Because it would be inactivated by the acid in the stomach
- D. It is secreted into the intestine
Correct Answer: B
Rationale: Pepsin is secreted into the stomach as pepsinogen by chief cells and activated by stomach acid. It does not digest the stomach due to the protective mucus layer.
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Kupffer's cells are found in ______________.
- A. Liver.
- B. Pancreas.
- C. Small intestine.
- D. Large intestine.
Correct Answer: A
Rationale: Kupffer cells are specialized macrophages located in the liver, where they play a role in filtering blood and immune response.
All about human tongue is true EXCEPT:
- A. Anterior 2/3 of Dorsal surface is covered by Parakeratinized epith.
- B. Post. 1/3 contain lingual tonsils.
- C. Its ventral surface has projections called lingual papilla.
- D. Contain skeletal muscle fibers arranged in 3 directions.
Correct Answer: C
Rationale: The ventral surface of the tongue is smooth and covered by non-keratinized stratified squamous epithelium, not lingual papillae, which are on the dorsal surface.
Following a diagnosis of Zollinger-Ellison syndrome, a 70-year-old woman undergoes gastrectomy. Her physician informs her that she will require lifelong intramuscular vitamin B12 injections. Which specific type of cells' absence is responsible for the need for vitamin replacement?
- A. Chief cells
- B. G cells
- C. Goblet cells
- D. Parietal cells
Correct Answer: D
Rationale: Parietal cells produce intrinsic factor, necessary for vitamin B12 absorption; their absence after gastrectomy necessitates B12 injections.
Number of teeth which are monophyodont in man is-
- A. 4
- B. 22
- C. 32
- D. 12
Correct Answer: D
Rationale: Humans have 12 monophyodont teeth (premolars and molars), which erupt only once, unlike diphyodont teeth (incisors, canines) that replace milk teeth.
Process of absorption of nutrients is carried out by
- A. Passive transport
- B. Facilitated transport
- C. Active transport
- D. All of the above
Correct Answer: D
Rationale: Nutrient absorption involves passive, facilitated, and active transport mechanisms.