Neco 2019 Biology Question 6

Practice essay / theory question 6 from the 2019 Neco Biology examination. This question covers Excretion .

Neco 2019 Biology Essay / Theory

Topic: Excretion

Question 6 NECO • 2019 • BIOLOGY • essay

A 35‑year‑old man presents for routine health screening. His glomerular filtration rate (GFR) is 120 mL min⁻¹ and the hydrostatic pressure in the glomerular capillaries (P_GC) is 45 mmHg, while the hydrostatic pressure in Bowman's space (P_BS) is 15 mmHg. His plasma protein concentration is initially 7 g dL⁻¹ but a recent dietary change has increased it to 9 g dL⁻¹. Assume the oncotic pressure (π) of plasma can be approximated by π = 2.5 × [protein] (mmHg).

Question Parts

( a )

Calculate the plasma oncotic pressure before and after the dietary change.

( b )

Determine the net filtration pressure (NFP) across the glomerular membrane before and after the change, assuming GFR and hydrostatic pressures remain unchanged.

( c )

Discuss how the increase in plasma protein concentration is likely to affect urine volume and the overall excretory function of the kidneys.

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About This Question

This is Neco 2019 Biology Question 6. It is one of the essay questions from the 2019 Neco Biology examination.

The question covers Excretion .

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