Gce Model Questions Vol1 2025 Biology Question 4

Practice essay / theory question 4 from the 2025 Gce Model Questions Vol1 Biology examination. This question covers respiration, human anatomy .

Gce Model Questions Vol1 2025 Biology Essay / Theory
Topics: respiration human anatomy
Question 4 GCE_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • essay
Gce Model Questions Vol1 2025 Biology Question 4 diagram

The diagram shows the major structures of the human respiratory system, each labelled from A to H.

Question Parts

( a )
State the anatomical structure represented by each label (A–H).
( b )
Describe the complete route taken by an inhaled molecule of oxygen from the external environment to the blood capillary surrounding an alveolus, referring to the labelled parts.
( c )
i) Define external respiration and internal respiration. ii) State where each occurs in the diagram and the direction of gas movement. iii) Explain how the structure of the alveolar wall facilitates diffusion.
( d )
A blockage in the right main bronchus (E) reduces airflow to the right lung. Discuss (i) the impact on overall oxygen uptake, (ii) the compensatory changes that may occur in the left lung, and (iii) two clinical signs that might be observed.

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About This Question

This is Gce Model Questions Vol1 2025 Biology Question 4. It is one of the essay questions from the 2025 Gce Model Questions Vol1 Biology examination.

The question covers respiration, human anatomy .

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