Nokea
The disease caused due to deficiency of nicotinic acid is
- A. Anaemia
- B. Osteomalacia
- C. Xerophthalmia
- D. Pellagra
Correct Answer: D
Rationale: Pellagra is caused by a deficiency of niacin (nicotinic acid), leading to symptoms like dermatitis, diarrhea, and dementia.
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What are the advantages of chewing food at the start of digestion?
- A. increasing surface area
- B. lubricating food
- C. making food soluble
- D. all of the above
Correct Answer: D
Rationale: Chewing increases the surface area for enzyme action, lubricates food with saliva, and helps dissolve food particles.
Amylase in saliva initiates digestion of:
- A. lipids
- B. proteins
- C. fats
- D. carbohydrates
Correct Answer: D
Rationale: Salivary amylase breaks down carbohydrates into simpler sugars.
All of the following are true of the stomach EXCEPT?
- A. Pepsinogen is activated to pepsin by HCl
- B. Parietal cells secrete intrinsic factor
- C. Chief cells secrete pepsinogen
- D. The pyloric region is a major site for nutrient absorption
Correct Answer: D
Rationale: The pyloric region primarily functions as a regulator of food movement into the small intestine, not as a major site for nutrient absorption.
Which process matches the definition: Thin, tough, outer layer of the alimentary tract, which enables it to move smoothly against other organs?
- A. Mucosa
- B. Submucosa
- C. Muscularis
- D. Serosa
Correct Answer: D
Rationale: The serosa is the outermost layer of the GI tract, allowing smooth movement against adjacent organs.
Match: Duodenum
- A. initial section of the small intestine where most chemical digestion occurs
- B. stores bile
- C. secretes insulin
- D. absorbs water
Correct Answer: A
Rationale: The duodenum is the first part of the small intestine where most chemical digestion takes place.