Edexcel IGCSE Biology 2.49 Ventilation role

Practise interpreting smoking and lung health data, linking oxygen use, breathlessness, lung cancer risk and circulatory disease.

Exam points

calculate and compare percentages from smoking and lung cancer death data
explain how smoking reduces oxygen uptake through mucus, tar or emphysema
link smoking to coronary heart disease using artery damage, narrowing or blood clots

[Maximum number: 3]

The diagram shows parts of the human respiratory system with some structures labelled.

Figure for Question 2.49 Biological consequences of smoking question 1 — Edexcel IGCSE Biology

A scientist compared the rate at which oxygen is used during exercise by a person who is a non-smoker with a person who is a smoker.

The rate is measured in $\mathrm{cm}^{3}$ per minute for each kilogram of body mass.
The table shows the scientist's results.

Table for Question 2.49 Biological consequences of smoking question 1 — Edexcel IGCSE Biology

Explain the effect of cigarette smoking on the rate at which oxygen is used.

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2.49 Biological consequences of smoking question 1