Gce Model Questions Vol1 2019 Biology Question 18

Practice objective / multiple choice question 18 from the 2019 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2019 Biology Objective / Multiple Choice Medium Difficulty
Question 18 GCE_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • objective

In a mammalian kidney, the renal plasma flow is 600 mL min\(^{-1}\) and the filtration fraction is 20 %.\n\n(a) Calculate the glomerular filtration rate (GFR) in mL min\(^{-1}\).\n(b) If 99 % of the filtered water is re‑absorbed and 85 % of the filtered sodium ions are re‑absorbed, determine (i) the volume of urine produced per hour and (ii) the amount of sodium excreted per hour, given that the plasma sodium concentration is 145 mmol L\(^{-1}\).

Answer Options

A. Urine volume ≈ 36 mL h⁻¹; Na⁺ excreted ≈ 7.9×10¹ mmol h⁻¹
B. Urine volume ≈ 360 mL h⁻¹; Na⁺ excreted ≈ 7.9×10² mmol h⁻¹
C. Urine volume ≈ 144 mL h⁻¹; Na⁺ excreted ≈ 3.1×10² mmol h⁻¹
Correct Answer D. Urine volume ≈ 72 mL h⁻¹; Na⁺ excreted ≈ 1.6×10² mmol h⁻¹
Correct Answer
D
Correct Option:
Urine volume ≈ 72 mL h⁻¹; Na⁺ excreted ≈ 1.6×10² mmol h⁻¹

About This Question

This is Gce Model Questions Vol1 2019 Biology Question 18. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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