Gce Model Questions Vol1 2018 Biology Question 5

Practice essay / theory question 5 from the 2018 Gce Model Questions Vol1 Biology examination. This question covers Transport .

Gce Model Questions Vol1 2018 Biology Essay / Theory
Topic: Transport
Question 5 GCE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay

In a mammalian body, the transport of oxygen from the lungs to the tissues involves several physiological steps.

Question Parts

( a )
Outline the complete pathway that oxygen follows from the alveolar air to a skeletal muscle cell, indicating the medium of transport at each stage and the principal physiological structures involved.
( b )
The partial pressure of oxygen (pO₂) in alveolar air is 100 mmHg and in systemic arterial blood is 95 mmHg. Haemoglobin can bind 1.34 mL O₂ per gram of Hb and the blood contains 150 g Hb per litre. Using Henry’s law (0.003 mL O₂ · L⁻¹ · mmHg⁻¹) for dissolved O₂, calculate the maximum amount of oxygen (in millilitres) that can be carried in 5 L of arterial blood. Show all steps of your calculation.
( c )
Discuss two physiological factors that can impair the efficiency of oxygen transport in the blood and the likely consequences for tissue metabolism.

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About This Question

This is Gce Model Questions Vol1 2018 Biology Question 5. It is one of the essay questions from the 2018 Gce Model Questions Vol1 Biology examination.

The question covers Transport .

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