Nokea
The greater omentum does not participate in:
- A. secretion of enzymes
- B. support and cushioning of the viscera
- C. storage of lipids
- D. protection against the spread of infection
Correct Answer: A
Rationale: The greater omentum provides structural support, lipid storage, and protection against infection spread, but it does not secrete enzymes.
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Which nerve is primarily responsible for the neural control of the gastric phase, including the stimulation of gastric secretions?
- A. Facial nerve
- B. Vagus nerve
- C. Glossopharyngeal nerve
- D. Spinal accessory nerve
Correct Answer: B
Rationale: The vagus nerve (cranial nerve X) is the primary nerve responsible for parasympathetic control of the stomach, stimulating gastric secretions and motility during the gastric phase.
All about vermilion zone (free red margin) of lip is true EXCEPT:
- A. Covered by modified mucous membrane
- B. The epith covering has clear keratin superficial layer.
- C. Show deep & numerous dermal papilla
- D. Show NO skin appendages.
Correct Answer: A
Rationale: The vermilion zone is covered by modified skin, not a mucous membrane, though it lacks skin appendages and has a thin keratin layer.
If for some reason the parietal cells of the gut epithelium become partially nonfunctional, what is likely to happen?
- A. The pH of stomach will fall abruptly
- B. Steapsin will be more effective
- C. Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones
- D. The pancreatic enzymes and specially the trypsin and lipase will not work efficiently
Correct Answer: C
Rationale: Parietal cells secrete HCl; if nonfunctional, the stomach pH rises, reducing pepsin's protein digestion efficiency.
Match: Villi
- A. projections in the small intestine that absorb nutrients
- B. storage structures
- C. enzyme producers
- D. muscular layers
Correct Answer: A
Rationale: Villi are finger-like projections in the small intestine that increase surface area for efficient nutrient absorption.
Optimum pH for salivary amylase
- A. 1.8
- B. 7.8
- C. 6.8
- D. 3.4
Correct Answer: C
Rationale: Salivary amylase (ptyalin) works optimally at a pH of around 6.8, close to neutral.