Neco 2025 Biology Question 6

Practice essay / theory question 6 from the 2025 Neco Biology examination. This question covers excretion in humans, urine formation, kidney anatomy .

Neco 2025 Biology Essay / Theory

Topics: excretion in humans urine formation kidney anatomy

Question 6 NECO • 2025 • BIOLOGY • essay

The diagram shows a longitudinal section of a human kidney with several structures labelled A–E. Use the diagram to answer the following questions.

Question Parts

( a )

Identify each labelled part in the diagram and write its correct anatomical name.

( b )

State the primary role of each of the following nephron components in urine formation:

( c )

A patient has a defect that reduces the permeability of the descending limb of the loop of Henle to water. Using the diagram, explain how this defect will affect (i) the concentration of the urine produced and (ii) its volume. Provide the physiological basis for your answer.

( d )

A drug that inhibits the Na⁺/K⁺/2Cl⁻ cotransporter in the thick ascending limb is administered. Predict the likely changes in (i) serum electrolyte concentrations and (ii) blood pressure, and justify your predictions.

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About This Question

This is Neco 2025 Biology Question 6. It is one of the essay questions from the 2025 Neco Biology examination.

The question covers excretion in humans, urine formation, kidney anatomy .

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