Nokea
An important function of the intestinal villi is to:
- A. increase the surface area for absorption of nutrients
- B. move chyme along the alimentary canal
- C. form a protective covering for the alimentary canal
- D. synthesise amino acids
Correct Answer: A
Rationale: Intestinal villi are finger-like projections that vastly increase the surface area of the small intestine for nutrient absorption.
You may also like to solve these questions
Which vitamin is produced by intestinal bacteria?
- A. B12
- B. A
- C. C
- D. D
Correct Answer: A
Rationale: Intestinal bacteria synthesize vitamin B12, which is absorbed in the ileum with intrinsic factor. Vitamins A, C, and D are not produced by gut bacteria.
Which of the following is not a function of saliva?
- A. to initiate protein digestion
- B. to aid in cleansing the teeth
- C. to lubricate the pharynx
- D. to assist in formation of the bolus
Correct Answer: A
Rationale: Saliva contains amylase for carbohydrate digestion, but it does not initiate protein digestion.
The function of the parietal cells of the stomach is to:
- A. Secrete pepsinogen for protein digestion
- B. Secrete mucus for lubrication
- C. Secrete the hormone gastrin
- D. Produce intrinsic factor required for absorption of vitamin B12
Correct Answer: D
Rationale: Parietal cells produce intrinsic factor, essential for vitamin B12 absorption, and hydrochloric acid, not the other functions listed.
(Auerbach's) plexus found in:
- A. Muscularis externa
- B. Submucosa
- C. Mucosa
- D. Serosa
Correct Answer: A
Rationale: Auerbach's plexus is located between the circular and longitudinal layers of the muscularis externa, controlling gut motility.
Which of the following vitamins helps in the maturation of red blood cells?
- A. Vitamin D.
- B. Vitamin A.
- C. Vitamin B12.
- D. Vitamin B.
Correct Answer: C
Rationale: Vitamin B12 is essential for the maturation of red blood cells and DNA synthesis.