Nokea
Ventral [lower] surface of hard palate is covered by:
- A. Pseudo stratifies columnar epith.
- B. Stratified squamous keratinized (parakeratinized).
- C. Stratified squamous non keratinized.
- D. Transitional epith.
Correct Answer: B
Rationale: The ventral surface of the hard palate is covered by stratified squamous epithelium that is keratinized (often parakeratinized) to withstand mechanical stress from food. Pseudostratified columnar epithelium is found in respiratory regions, not here.
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Which of the following inactivates pepsinogen into active pepsin?
- A. Ptyalin.
- B. HCL.
- C. Bile.
- D. Renin.
Correct Answer: B
Rationale: Hydrochloric acid (HCL) in the stomach activates pepsinogen, converting it into its active form, pepsin.
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.
In the buccal cavity of human being, digestion of which one of the following get started?
- A. Protein
- B. Fat
- C. Carbohydrates
- D. Nucleic acids
Correct Answer: C
Rationale: The digestion of carbohydrates begins in the buccal cavity due to the action of salivary amylase, which breaks down starches into simpler sugars.
A client with an elevated amylase level asks the nurse about the altered value. The nurse bases a response on knowledge that amylase:
- A. Is an enzyme from the pancreas needed for carbohydrate digestion
- B. Plays no significant role in physiological processes
- C. Is an enzyme from the pancreas needed for fat digestion
- D. Is an enzyme from the pancreas that is the major component of bile
Correct Answer: A
Rationale: Amylase, produced by the pancreas, digests carbohydrates into sugars.
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.