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IB Biology SL B3.1.4 Mammalian Lung Adaptations Questions

Explore how many alveoli, short diffusion paths, capillary beds and surfactant support ventilation and gas exchange in IB Biology SL B3.1.4.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Relate many small alveoli, thin squamous walls and dense capillary beds to a large area and short diffusion path for gas exchange.
  • Explain how ventilation, surfactant and elastic fibres maintain moist, open alveoli and support recoil during breathing.
  • Use emphysema or lung-function evidence to predict how loss of alveolar surface or elastic support reduces gas exchange.

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Study B3.1.4—Mammalian lung adaptations conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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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