A-LevelBiologyGas exchange9700/12 · Oct/Nov 2022 · Q361 Mark
What can be found in the wall of an alveolus in the lungs of a human?
Acartilage: ✓, cilia: x, elastic fibres: x, key: ✓ = present, x = not present
Bcartilage: x, cilia: x, elastic fibres: ✓, key: ✓ = present, x = not present
Ccartilage: ✓, cilia: ✓, elastic fibres: x, key: ✓ = present, x = not present
Dcartilage: x, cilia: ✓, elastic fibres: ✓, key: ✓ = present, x = not present
✓ Correct answer
B: cartilage: x, cilia: x, elastic fibres: ✓, key: ✓ = present, x = not present
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