Gce Model Questions Vol1 2023 Biology Question 20

Practice objective / multiple choice question 20 from the 2023 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2023 Biology Objective / Multiple Choice Medium Difficulty
Question 20 GCE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

In a subject the plasma flow to the kidneys is 600 mL min⁻¹ and the filtration fraction is 0.20. Plasma glucose concentration is 5 mmol L⁻¹. Normally, 99 % of the filtered glucose is re‑absorbed in the proximal tubule. A drug reduces the re‑absorption efficiency to 95 %. Calculate (a) the glomerular filtration rate (GFR), (b) the amount of glucose excreted per minute (mmol min⁻¹) after the drug is administered, and (c) the percentage increase in glucose excretion compared with the normal situation.

Answer Options

A. (a) GFR = 120 mL min⁻¹ (0.12 L min⁻¹); (b) glucose excreted = 0.05 mmol min⁻¹; (c) excretion increases by 800 % compared with normal.
Correct Answer B. (a) GFR = 120 mL min⁻¹ (0.12 L min⁻¹); (b) glucose excreted = 0.03 mmol min⁻¹; (c) excretion increases by 400 % compared with normal.
C. (a) GFR = 100 mL min⁻¹ (0.10 L min⁻¹); (b) glucose excreted = 0.02 mmol min⁻¹; (c) excretion increases by 300 % compared with normal.
D. (a) GFR = 150 mL min⁻¹ (0.15 L min⁻¹); (b) glucose excreted = 0.04 mmol min⁻¹; (c) excretion increases by 500 % compared with normal.
Correct Answer
B
Correct Option:
(a) GFR = 120 mL min⁻¹ (0.12 L min⁻¹); (b) glucose excreted = 0.03 mmol min⁻¹; (c) excretion increases by 400 % compared with normal.

About This Question

This is Gce Model Questions Vol1 2023 Biology Question 20. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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