Nokea
Which of the following parts of the digestive system has the most important role in nutrient absorption?
- A. stomach
- B. esophagus
- C. large intestines
- D. small intestines
Correct Answer: D
Rationale: The small intestine is the primary site for nutrient absorption due to its large surface area and specialized structures like villi and microvilli.
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Isthmus of fundic [gastric] gland contain the following except:
- A. Surface epithelial cells
- B. Parietal cells
- C. Chief cells.
- D. Stem cells
Correct Answer: C
Rationale: The isthmus contains stem cells, surface epithelial cells, and parietal cells, but chief cells are found deeper in the gland body and base.
Striated ducts, the following is true except:
- A. Lined by ion transporting cells
- B. Contain basal basophilic granules
- C. Contain basal acidophilic granules
- D. Present in salivary gland duct system.
Correct Answer: B
Rationale: Striated ducts have basal acidophilic striations due to mitochondria, not basophilic granules.
Which of the given enzymes is responsible for the digestion of milk protein?
- A. Erepsin
- B. Trypsin
- C. Pepsin
- D. Rennin
Correct Answer: D
Rationale: Rennin is responsible for the digestion of milk protein. Rennin is present in the human body in its inactive form called prorenin. When we consume milk, it reacts with the hydrochloric acid present in the stomach. Hydrochloric acid activates the inert prorenin and converts it into active Rennin.
How many muscles does the action of swallowing use?
- A. 92
- B. 6
- C. 60
- D. 29
Correct Answer: D
Rationale: Swallowing involves approximately 29 muscles, including those in the pharynx and esophagus, coordinated by the autonomic nervous system.
Carboxypeptidase requires _______ for its activity
- A. Copper
- B. Niacin
- C. Iron
- D. Zn
Correct Answer: D
Rationale: Carboxypeptidase is a zinc-dependent enzyme that breaks down proteins into amino acids.