CAIE A-Level Biology AS 9.1.1 Structure of Human Gas Exchange System Questions
Describe human gas-exchange system structure and adaptations using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Describe the structure of the human gas exchange system and its adaptations.
CAIE A-Level Biology AS 9.1.1 Structure of Human Gas Exchange System Questions question 1
The Weibel Lung model was developed after an extensive study of the gas exchange system. The model includes detailed measurements of airway diameters (lumen diameters of the airways). In the model, different parts of the gas exchange system are identified with a generation number, as outlined in Fig. 6.1.
Fig. 6.1
The Weibel Lung model describes how each airway divides into two.
Name the airways in generation 1, labelled X in Fig. 6.1, that branch from generation 0.
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