Neco Model Questions Vol1 2023 Biology Question 6

Practice essay / theory question 6 from the 2023 Neco Model Questions Vol1 Biology examination. This question covers excretory system, kidney anatomy, nephron function, urine formation, hormonal regulation of water balance .

Neco Model Questions Vol1 2023 Biology Essay / Theory
Topics: excretory system kidney anatomy nephron function urine formation hormonal regulation of water balance
Question 6 NECO_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • essay
Neco Model Questions Vol1 2023 Biology Question 6 diagram

The diagram shows a cross‑section of a human kidney with a single nephron labelled as follows: A – Renal cortex, B – Renal medulla, C – Renal pelvis, D – Glomerulus, E – Bowman's capsule, F – Proximal convoluted tubule, G – Descending limb of loop of Henle, H – Ascending limb of loop of Henle, I – Distal convoluted tubule, J – Collecting duct.

Question Parts

( a )
Identify each labelled part in the diagram and state its primary role in urine formation.
( b )
Describe, in the correct order, the processes that occur from the filtration of blood to the formation of urine, referring to the labelled structures.
( c )
Explain how antidiuretic hormone (ADH) modifies water reabsorption in the nephron, indicating which labelled part(s) are directly affected and the physiological consequence for urine output.
( d )
A patient is administered a drug that blocks ADH receptors. Predict the changes in (i) urine volume, (ii) urine osmolality and (iii) the part of the nephron where the most noticeable effect will be observed. Justify your answer using the labelled diagram.

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About This Question

This is Neco Model Questions Vol1 2023 Biology Question 6. It is one of the essay questions from the 2023 Neco Model Questions Vol1 Biology examination.

The question covers excretory system, kidney anatomy, nephron function, urine formation, hormonal regulation of water balance .

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