IB Biology HL B2.3.8 Hl Pneumocytes in Alveoli Questions

Explore how thin type I pneumocytes minimize diffusion distance while type II pneumocytes secrete surfactant to stabilize alveoli in IB Biology HL B2.3.8.

Exam points

Distinguish flattened, thin type I pneumocytes for gas diffusion from cuboidal type II pneumocytes that secrete surfactant.
Explain how type II surfactant lowers alveolar surface tension and prevents alveoli sticking or collapsing.
Use alveolar micrograph or cell-function evidence to identify pneumocyte adaptations that support efficient gas exchange.

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Study B2.3.8 (HL)—Pneumocytes in alveoli conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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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.

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Outline the function of pneumocytes in the lungs.

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IB Biology HL B2.3.8 Hl Pneumocytes in Alveoli Questions question 1