Nokea
Which of the following is synthesized and stored in the liver cells?
- A. Galactose
- B. Lactose
- C. Glycogen
- D. Arabinose
Correct Answer: C
Rationale: Glycogen is synthesized and stored in the liver for energy reserve.
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Endothelial cells of liver sinusoids, the following is true except:
- A. Lie on a discontinuous basal lamina
- B. Separated from hepatocytes by space of Disse
- C. The underlying space of Disse contain red blood cells
- D. The fenestra on its surface are collected at areas called sieve plates
Correct Answer: C
Rationale: The space of Disse contains plasma and microvilli, not red blood cells, which remain in the sinusoidal lumen.
What happens during the intestinal phase of digestion?
- A. Food is swallowed
- B. Chyme is processed and nutrients absorbed
- C. Water is absorbed
- D. Saliva breaks down starch
Correct Answer: B
Rationale: In the intestinal phase, chyme is mixed with pancreatic juice and bile, and nutrients are absorbed primarily in the small intestine.
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.
Which tubules are the effectors for ADH?
- A. Distal and collecting
- B. Proximal and collecting
- C. Loop of Henle and Distal
- D. Loop of Henle and proximal
Correct Answer: A
Rationale: ADH acts on the distal convoluted tubule and collecting duct to increase water reabsorption.
Which organ listed below does not belong in digestive system?
- A. liver
- B. spleen
- C. tongue
- D. stomach
Correct Answer: B
Rationale: The spleen is part of the lymphatic and immune systems, not the digestive system.