Waec Model Questions Vol1 2022 Biology Question 28
Practice objective / multiple choice question 28 from the 2022 Waec Model Questions Vol1 Biology examination.
In a mammal the glomerular filtration rate (GFR) is 120 mL min⁻¹. The filtrate contains Na⁺ at a concentration of 140 mmol L⁻¹. In the proximal tubule 99 % of water, 85 % of Na⁺ and all glucose are re‑absorbed. The remaining filtrate then enters the loop of Henle where 60 % of the remaining water and 50 % of the remaining Na⁺ are re‑absorbed. No glucose is present beyond the proximal tubule. What amount of Na⁺ is excreted per minute (in mmol min⁻¹)?
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This is Waec Model Questions Vol1 2022 Biology Question 28. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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