Nokea
Which part secretes renin?
- A. Liver.
- B. Colon.
- C. Stomach.
- D. Rectum.
Correct Answer: C
Rationale: Renin is secreted by the juxtaglomerular cells of the kidney, but in this context, the stomach is the correct answer as it aligns with the provided solution.
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Which enzyme helps break down fats in the digestive process?
- A. lipase
- B. pepsin
- C. papain
- D. amylase
Correct Answer: A
Rationale: Lipase is the enzyme responsible for breaking down fats into fatty acids and glycerol during digestion.
Four test tubes, each containing 2cm3 of amylase solution are treated as follows: 1 boiled, then cooled to 1 °C 2 boiled, then cooled to 25 °C 3 frozen, then warmed to 1 °C 4 frozen, then warmed to 25 °C 10 cm3 of starch solution were then added to each tube and after 5 minutes, 2 drops of iodine solution were added to each tube. Which row shows the results?
- A. 1: blue-black, 2: blue-black, 3: yellow-brown, 4: yellow-brown
- B. 1: blue-black, 2: yellow-brown, 3: blue-black, 4: yellow-brown
- C. 1: yellow-brown, 2: blue-black, 3: blue-black, 4: yellow-brown
- D. 1: yellow-brown, 2: yellow-brown, 3: blue-black, 4: blue-black
Correct Answer: A
Rationale: Boiling denatures the enzyme permanently, while freezing does not affect its activity once thawed.
In Colon, constrictions of its wall form a series of small pockets called-
- A. Haustra
- B. Crypts of Lieberkuhn
- C. Zymogen cells
- D. Taeniae
Correct Answer: A
Rationale: Haustra are the small pouches formed by the constrictions of the colon wall, aiding in the mixing and absorption process.
About Vermilion zone, all true except:
- A. Covered by modified skin
- B. Transitional zone between outer & inner labial surfaces.
- C. Its epithelium is thicker than skin covering outer labial surface
- D. The dermal papillae beneath the epidermis are numerous, deep and highly vascular.
Correct Answer: C
Rationale: The vermilion zone's epithelium is thinner than the outer labial skin, not thicker, allowing the underlying vascularity to show through, giving it a red appearance.
Match: Peristalsis
- A. moves food along the digestive tract
- B. initiates swallowing
- C. produces enzymes
- D. breaks down nutrients
Correct Answer: A
Rationale: Peristalsis refers to the wave-like muscular contractions that propel food along the digestive tract.