Waec Model Questions Vol1 2023 Biology Question 2

Practice objective / multiple choice question 2 from the 2023 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2023 Biology Objective / Multiple Choice Medium Difficulty
Question 2 WAEC_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

In a kidney the glomerular filtration rate is 120 mL min⁻¹. The primary filtrate contains Na⁺ at 140 mmol L⁻¹. Reabsorption percentages are: proximal tubule - 99 % of Na⁺ and 85 % of water; loop of Henle - 60 % of the remaining Na⁺ and 15 % of the remaining water; distal tubule - 50 % of the remaining Na⁺ and 40 % of the remaining water; collecting duct - 80 % of the remaining water (no further Na⁺ reabsorption). Assuming no secretion, calculate (a) the volume of urine formed per minute and (b) the amount of Na⁺ excreted per minute.

Answer Options

A. Urine volume ≈ 1.2 mL min⁻¹; Na⁺ excreted ≈ 0.05 mmol min⁻¹
B. Urine volume ≈ 2.5 mL min⁻¹; Na⁺ excreted ≈ 0.12 mmol min⁻¹
C. Urine volume ≈ 0.9 mL min⁻¹; Na⁺ excreted ≈ 0.20 mmol min⁻¹
Correct Answer D. Urine volume ≈ 1.84 mL min⁻¹; Na⁺ excreted ≈ 0.034 mmol min⁻¹
Correct Answer
D
Correct Option:
Urine volume ≈ 1.84 mL min⁻¹; Na⁺ excreted ≈ 0.034 mmol min⁻¹

About This Question

This is Waec Model Questions Vol1 2023 Biology Question 2. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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