Companion PDF worksheet for Edexcel IGCSE Biology Lecture 20 - The Alveoli and Lung Disease. Contains short answer questions, an activity requiring lateral thinking and exam-style questions.
Specification Point 2.48 - Explain how alveoli are adapted for gas exchange by diffusion between air in the lungs and blood in capillaries.
Specification Point 2.49 - Understand the biological consequences of smoking in relation to the lungs and the circulatory system, including coronary heart disease.
Specification Point 2.50 - Practical: Investigate breathing in humans, including the release of carbon dioxide and the effect of exercise.
Complete set of Chapter 3 Worksheets are available.
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