Nokea
Disaccharides are digested by
- A. secretin
- B. disaccharidase
- C. lipase
- D. pepsin
Correct Answer: B
Rationale: Disaccharidases, such as sucrase, lactase, and maltase, digest disaccharides into monosaccharides for absorption.
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Which of the following enzymes formed in the pancreas aids in protein digestion?
- A. Amylase
- B. Lipase
- C. Trypsinogen
- D. Trypsin
Correct Answer: D
Rationale: Trypsin, activated from trypsinogen, is a pancreatic enzyme that digests proteins.
Meissner's plexus is found in:
- A. Muscularis externa
- B. Submucosa
- C. Mucosa
- D. Serosa
Correct Answer: B
Rationale: Meissner's plexus is located in the submucosa and regulates glandular secretion and local blood flow.
Where is water mainly absorbed in the alimentary canal?
- A. Small intestine
- B. Stomach
- C. Large intestine
- D. Esophagus
Correct Answer: C
Rationale: The large intestine absorbs most of the remaining water from digested material, forming semi-solid feces.
A 70-year-old male patient is experiencing symptoms of constipation, bloating, and abdominal discomfort. Physical examination reveals visible distension of the abdomen, and a contrast study shows dilation of the large intestine. Which of the following motility disorders is the most probable cause of the patient's symptoms?
- A. Excessive peristalsis in the large intestine
- B. Impaired segmentation in the small intestine
- C. Reduced peristalsis in the large intestine
- D. Excessive segmentation in the small intestine
Correct Answer: C
Rationale: Reduced peristalsis in the large intestine slows transit, leading to constipation, bloating, and dilation, as seen in the contrast study.
During active HCL secretion parietal cell shows:
- A. Few short microvilli while tubulovesicular system increases.
- B. Microvilli are prominent numerous while the tubulovesicular system decreases.
- C. More rER & secretory vesicles
- D. Cytoplasm becomes more basophilic
Correct Answer: B
Rationale: During active HCl secretion, parietal cells' intracellular canaliculi expand with numerous microvilli, and the tubulovesicular system decreases as it fuses with the canaliculi.