Gce Model Questions Vol1 2021 Biology Question 6

Practice essay / theory question 6 from the 2021 Gce Model Questions Vol1 Biology examination. This question covers Excretion .

Gce Model Questions Vol1 2021 Biology Essay / Theory

Topic: Excretion

Question 6 GCE_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • essay

A laboratory investigation measured the concentrations of urea and creatinine in the urine and blood of a patient with suspected renal impairment. The data obtained are shown below: • Urine volume (V) = 1.5 L day⁻¹ • Urine urea concentration (U_urea) = 20 g L⁻¹ • Urine creatinine concentration (U_cr) = 0.8 g L⁻¹ • Blood urea concentration (P_urea) = 7 g L⁻¹ • Blood creatinine concentration (P_cr) = 0.12 g L⁻¹ Using these data, answer the following questions.

Question Parts

( a )

Calculate the renal clearance of urea (C_urea) in mL min⁻¹. Show all steps.

( b )

Calculate the renal clearance of creatinine (C_cr) in mL min⁻¹, showing all steps.

( c )

Compare the two clearances obtained and interpret what they reveal about the patient’s renal function, particularly in relation to glomerular filtration rate (GFR).

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About This Question

This is Gce Model Questions Vol1 2021 Biology Question 6. It is one of the essay questions from the 2021 Gce Model Questions Vol1 Biology examination.

The question covers Excretion .

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