Nokea
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.
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Match: Peristalsis
- A. moves food along the digestive tract
- B. initiates swallowing
- C. produces enzymes
- D. breaks down nutrients
Correct Answer: A
Rationale: Peristalsis refers to the wave-like muscular contractions that propel food along the digestive tract.
How much of your blood passes through your kidneys each day?
- A. half of it
- B. none of it
- C. all of it
- D. one-quarter of it
Correct Answer: C
Rationale: All of your blood is filtered by the kidneys multiple times daily to remove wastes.
In Colon, constrictions of its wall form a series of small pockets called-
- A. Haustra
- B. Crypts of Lieberkuhn
- C. Zymogen cells
- D. Taeniae
Correct Answer: A
Rationale: Haustra are the small pouches formed by the constrictions of the colon wall, aiding in the mixing and absorption process.
Based on knowledge of the pancreas's role in digestion, what substance produced by the pancreas may be required as a supplement for long-term health management after its surgical removal?
- A. Pancreatic enzymes
- B. Vitamin B12
- C. Gastrin
- D. Bile salts
Correct Answer: A
Rationale: Pancreatic enzyme supplements are needed post-pancreatectomy to aid digestion.
Which of the following parts of the alimentary canal bears villi?
- A. Stomach.
- B. Ileum.
- C. Oesophagus.
- D. Rectum.
Correct Answer: B
Rationale: The ileum, part of the small intestine, contains villi that increase the surface area for nutrient absorption.