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IB Biology SL B3.1.4 Mammalian Lung Adaptations Questions

Practise how alveolar surface area, thin walls and capillary beds support gas exchange, and explain how surfactant and emphysema affect lung function.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Link many alveoli, thin walls and capillary beds to efficient gas exchange.
  • Explain how ventilation and capillary blood flow maintain alveolar gas gradients.
  • Explain how surfactant lowers surface tension and helps keep alveoli open.
  • Use emphysema evidence to link loss of alveolar area and elasticity to reduced gas exchange.

IB Biology SL B3.1.4 Mammalian Lung Adaptations Questions question 1

[Maximum number: 3]

Describe three features of alveoli that adapt them to gas exchange.

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