Igcse Model Questions Vol1 2025 Biology Question 5

Practice essay / theory question 5 from the 2025 Igcse Model Questions Vol1 Biology examination. This question covers Transport .

Igcse Model Questions Vol1 2025 Biology Essay / Theory
Topic: Transport
Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • essay

In mammals, the transport of oxygen from the external environment to the cells involves several structures and processes.

Question Parts

( a )
Describe the complete pathway that oxygen follows from the moment it is inhaled until it reaches the body cells. Include all major anatomical structures.
( b )
Explain how the structural features of capillary walls enable efficient exchange of oxygen and carbon dioxide between the blood and surrounding tissues.
( c )
A student records a partial pressure of oxygen (pO₂) of 100 kPa in alveolar air but only 95 kPa in systemic arterial blood. Discuss two physiological factors that could account for this difference.

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About This Question

This is Igcse Model Questions Vol1 2025 Biology Question 5. It is one of the essay questions from the 2025 Igcse Model Questions Vol1 Biology examination.

The question covers Transport .

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