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CAIE A-Level Biology 9.1.2 Tissue Distribution in the Gas Exchange System

Practise mapping cartilage, muscle, elastic fibres, cilia, goblet cells, squamous epithelium and capillaries to distinguish trachea, bronchi, bronchioles and alveoli.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • locate cartilage and ciliated goblet-cell epithelium in trachea and bronchi
  • recognise bronchioles by absent cartilage and relatively prominent smooth muscle
  • place squamous epithelium, elastic fibres and capillaries at alveolar surfaces

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