Neco 2021 Biology Question 6

Practice essay / theory question 6 from the 2021 Neco Biology examination. This question covers excretion .

Neco 2021 Biology Essay / Theory

Topic: excretion

Question 6 NECO • 2021 • BIOLOGY • essay

The diagram shows the functional unit of the human excretory system (the nephron) with the parts labelled A–F as indicated in the visual.

Question Parts

( a )

State the correct anatomical name for each labelled part (A, B, C, D, E and F).

( b )

For each of the following physiological processes, indicate the nephron segment where it primarily occurs and briefly state its significance.

( ) Ultrafiltration of blood

( ) Reabsorption of glucose and amino acids

( ) Secretion of hydrogen ions

( ) Concentration of urine

( c )

Explain how antidiuretic hormone (ADH) modifies water re‑absorption in the nephron, specifying the segment(s) affected and the cellular mechanism involved.

( d )

A patient has a defect that reduces the permeability of the descending limb of the Loop of Henle to water. Predict the likely effect on urine volume and concentration, and justify your answer.

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About This Question

This is Neco 2021 Biology Question 6. It is one of the essay questions from the 2021 Neco Biology examination.

The question covers excretion .

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