Neco Model Questions Vol1 2020 Biology Question 6

Practice essay / theory question 6 from the 2020 Neco Model Questions Vol1 Biology examination. This question covers excretion, urinary system, nephron .

Neco Model Questions Vol1 2020 Biology Essay / Theory
Topics: excretion urinary system nephron
Question 6 NECO_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay
Neco Model Questions Vol1 2020 Biology Question 6 diagram

The diagram shows the human excretory system. The kidney is illustrated in detail with a labelled nephron. Labels A–K correspond to the structures listed in the diagram specification.

Question Parts

( a )
Identify the structures labelled A–K in the diagram.
( b )
Describe the sequence of events that lead to the formation of urine, linking each step to the appropriate labelled part of the diagram.
( c )
The filtrate entering Bowman's capsule contains 180 mM NaCl. After passage through the loop of Henle its NaCl concentration is 120 mM. Calculate the percentage reduction in NaCl concentration and discuss the physiological importance of this change.
( d )
A defect reduces water reabsorption in the collecting duct (K) by 30 %. Predict the likely effect on (i) urine volume and (ii) urine osmolarity, giving a brief explanation based on the diagram.

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About This Question

This is Neco Model Questions Vol1 2020 Biology Question 6. It is one of the essay questions from the 2020 Neco Model Questions Vol1 Biology examination.

The question covers excretion, urinary system, nephron .

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