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CAIE IGCSE Biology 11.1.1 Alveolar Gas Exchange Adaptations

Practise explaining how alveoli provide a large, thin, ventilated and well-perfused surface for rapid diffusion.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify alveoli as the human gas exchange surface
  • link many alveoli to large area and one-cell-thick walls to a short diffusion distance
  • explain how ventilation and a good capillary supply maintain steep oxygen and carbon-dioxide gradients

11.1.1—Features of gas exchange surfaces question 1

[Maximum number: 3]

Fig. 6.1 shows part of the human gas exchange system.

Fig. 6.1

Fig. 6.1

Describe and explain how the alveoli are adapted for gas exchange.

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