Neco 2025 Biology Question 18
Practice objective / multiple choice question 18 from the 2025 Neco Biology examination.
A person has a glomerular filtration rate (GFR) of \(120\) mL min\(^{-1}\). The filtrate initially contains \(140\) mM NaCl. In the proximal tubule 65 % of NaCl and 30 % of water are reabsorbed. In the loop of Henle an additional 15 % of the remaining NaCl and 20 % of the remaining water are reabsorbed. The distal tubule reabsorbs 10 % of the NaCl left and 25 % of the water left. The collecting duct reabsorbs 5 % of the remaining NaCl and 40 % of the remaining water. Calculate the final concentration of NaCl in the urine (in mM) and the urine flow rate (in mL min\(^{-1}\)).
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About This Question
This is Neco 2025 Biology Question 18. It is one of the objective questions from the 2025 Neco Biology examination.
Difficulty level: Medium .
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