Nokea
The loop of Henle pumps sodium ions from the ascending arm to the descending. What is this called?
- A. Counter current subtractor
- B. Counter current divider
- C. Counter current concentrator
- D. Counter current multiplier
Correct Answer: D
Rationale: The countercurrent multiplier in the loop of Henle concentrates urine by moving sodium ions.
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The glomerular capillaries are where?
- A. Collecting duct
- B. Bowman's capsule
- C. Loop of Henle
- D. Proximal convoluted tubule
Correct Answer: B
Rationale: Glomerular capillaries are in Bowman's capsule, where filtration occurs.
CAVEOLATED CELLS all true except:
- A. Rare cells in gastric & intestinal mucosa may be chemoreceptor
- B. Their microvilli are long twice the length of those nearby cells
- C. Apical cell membrane shows deep tubular invaginations (Caveolae).
- D. Important cell for mucosal regeneration
Correct Answer: D
Rationale: Caveolated (tuft) cells are sensory, not regenerative; stem cells handle mucosal regeneration.
A carbohydrate splitting enzyme is secreted by -
- A. Liver
- B. Zymogen cells of gastric glands
- C. Spleen
- D. Crypts of Lieberkuhn
Correct Answer: D
Rationale: Crypts of Lieberkuhn secrete enzymes like maltase that split carbohydrates.
Proteins are composed of substances called
- A. lipids
- B. amino acids
- C. carbohydrates
- D. nucleotides
Correct Answer: B
Rationale: Proteins are polymers of amino acids, their fundamental building blocks.
The structure which prevents entry of food into wind pipe during swallowing in mammals is-
- A. Larynx
- B. Glottis
- C. Epiglottis
- D. Pharynx
Correct Answer: C
Rationale: The epiglottis closes over the glottis during swallowing to prevent food from entering the trachea.