IGCSE Biology - 2g Gas Exchange - Humans

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New Edexcel IGCSE 9-1 4BI1 syllabus for 2017 first examined in 2019


Section 2g Gas Exchange - Humans


  • 2.46 describe the structure of the thorax, including the ribs, intercostal muscles, diaphragm, trachea, bronchi, bronchioles, alveoli and pleural membranes
  • 2.47 understand the role of the intercostal muscles and the diaphragm in ventilation
  • 2.48 explain how alveoli are adapted for gas exchange by diffusion between air in the lungs and blood in capillaries
  • 2.49 understand the biological consequences of smoking in relation to the lungs and the circulatory system, including coronary heart disease
  • 2.50 practical: investigate breathing in humans, including the release of carbon dioxide and the effect of exercise


New and updated resource for IGCSE 9-1- More practical pages, updated design, concept checker and exam style question for each topic.