Igcse Model Questions Vol1 2023 Biology Question 4

Practice essay / theory question 4 from the 2023 Igcse Model Questions Vol1 Biology examination. This question covers respiration, gas exchange, ventilation, respiratory anatomy .

Igcse Model Questions Vol1 2023 Biology Essay / Theory
Topics: respiration gas exchange ventilation respiratory anatomy
Question 4 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • essay
Igcse Model Questions Vol1 2023 Biology Question 4 diagram

The labelled diagram shows the main structures of the human respiratory system.

Question Parts

( a )
Describe the complete pathway that a breath of air follows from the external environment to the alveoli, naming each structure it passes through.
( b )
Explain how the structural features of the alveoli make them especially suited for gas exchange.
( c )
A disease reduces the total alveolar surface area by 40 % while the thickness of the alveolar membrane remains unchanged. Using Fick’s law (rate of diffusion ∝ surface area ÷ thickness), discuss the expected effect on the rate of oxygen diffusion and the likely physiological consequence for the individual.
( d )
Compare external respiration with cellular respiration, highlighting the role of the respiratory system in each process.

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About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 4. It is one of the essay questions from the 2023 Igcse Model Questions Vol1 Biology examination.

The question covers respiration, gas exchange, ventilation, respiratory anatomy .

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