Cambridge IGCSE Biology
11.1Gas exchange in humans
Gas exchange in humans in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic42 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 11.1.1Describe the features of gas exchange surfaces in humans and identify the parts of the breathing system.
- 11.1.2Investigate and describe the differences in oxygen, carbon dioxide and water vapour between inspired and expired air, using limewater to test for carbon dioxide.
- 11.1.3Investigate and describe the effects of physical activity on the rate and depth of breathing.
- 11.1.4Supplement: identify the internal and external intercostal muscles, state the function of cartilage in the trachea, and explain how the ribs, intercostal muscles and diaphragm cause the volume and pressure changes that ventilate the lungs.
- 11.1.5Supplement: explain the differences between inspired and expired air, and explain how increased carbon dioxide in the blood, detected by the brain, increases the rate and depth of breathing during exercise.
- 11.1.6Supplement: explain how goblet cells, mucus and ciliated cells protect the breathing system from pathogens and particles.
Lessons
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Inspired and expired air, and breathing during exercise
18 min
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The breathing system and ventilation
18 min
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Sample question
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