Igcse Model Questions Vol1 2018 Biology Question 4

Practice essay / theory question 4 from the 2018 Igcse Model Questions Vol1 Biology examination. This question covers respiration .

Igcse Model Questions Vol1 2018 Biology Essay / Theory
Topic: respiration
Question 4 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay
Igcse Model Questions Vol1 2018 Biology Question 4 diagram

The diagram shows a labelled schematic of the human respiratory system.

Question Parts

( a )
Starting at the labelled entry point for air, describe the complete pathway that air follows to reach the site of gas exchange. Mention each labelled part in the correct order.
( b )
Explain how the structure of the alveoli (label G) facilitates efficient gas exchange. Include in your answer the role of surface area and diffusion distance.
( c )
Using the diagram, compare the pressure changes in the thoracic cavity during inhalation and exhalation and describe how the diaphragm (label H) contributes to these changes.
( d )
A patient with asthma experiences narrowing of the bronchioles (label F). Using the diagram, explain how this narrowing affects airflow and gas exchange, and suggest two management strategies that could alleviate the problem.

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About This Question

This is Igcse Model Questions Vol1 2018 Biology Question 4. It is one of the essay questions from the 2018 Igcse Model Questions Vol1 Biology examination.

The question covers respiration .

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