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IB Biology HL 2.3.8 Pneumocytes in Alveoli Question Bank

Practise IB Biology HL 2.3.8 through exact HL questions on pneumocyte structure, surfactant stability, alveolar geometry and gas exchange.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse how pneumocyte structure, surfactant and alveolar geometry support gas exchange.
  • Use microscopy and function evidence to distinguish type I from type II pneumocytes.
  • Evaluate how surfactant loss changes alveolar stability and respiratory performance.

B2.3.8 (HL)—Pneumocytes in alveoli question 1

[Maximum number: 2]

Measurements of the lung capacity of a student were recorded using a spirometer and displayed with a data logger. Initially the student was at rest, then changed to carrying out strenuous exercise. The results are displayed in the graph.

Figure for Question B2.3.8 (HL)—Pneumocytes in alveoli question 1 — IB Biology HL

Outline the function of pneumocytes in the lungs.

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