Nokea
What is the name of the cells that secrete hydrochloric acid into the stomach?
- A. Gastric pits
- B. Chief cells
- C. Parietal cells
- D. Enteroendocrine cells
Correct Answer: C
Rationale: Parietal cells secrete hydrochloric acid (HCl) into the stomach to aid in digestion. Gastric pits are structures, not cells; chief cells secrete pepsinogen; enteroendocrine cells release hormones.
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About esophagus, all are true EXCEPT:
- A. Lined by st sq epith
- B. Glands are present mainly in submucosa
- C. Muscularis externa are formed entirely of smooth muscles.
- D. Muscularis mucosa is well developed in the lower half
Correct Answer: C
Rationale: The muscularis externa of the esophagus transitions from skeletal muscle (upper third) to smooth muscle (lower third), not entirely smooth muscle.
What happens during the intestinal phase of digestion?
- A. Food is swallowed
- B. Chyme is processed and nutrients absorbed
- C. Water is absorbed
- D. Saliva breaks down starch
Correct Answer: B
Rationale: In the intestinal phase, chyme is mixed with pancreatic juice and bile, and nutrients are absorbed primarily in the small intestine.
All about foliate papilla is true EXCEPT:
- A. Present at tip & sides of tongue rabbit
- B. Covered by st sq nonkeratinized epith.
- C. Rare in human but numerous in rabbits
- D. Its sides carry taste buds.
Correct Answer: A
Rationale: Foliate papillae are located on the posterolateral sides of the tongue, not the tip, and are rudimentary in humans but prominent in rabbits.
Match: Protein
- A. composed of amino acids; building blocks for body tissues
- B. major source of energy
- C. used for insulation
- D. stored as glycogen
Correct Answer: A
Rationale: Proteins are macromolecules composed of amino acids, essential for building and repairing body tissues.
Proteolytic enzyme of stomach is -
- A. Trypsin
- B. Pepsin
- C. Chymotrypsin
- D. Carboxypeptidase
Correct Answer: B
Rationale: Pepsin is the main proteolytic enzyme in the stomach, active in acidic pH.