A-LevelBiologyGas exchange9700/12 · Oct/Nov 2021 · Q331 Mark
The image shown is a photomicrograph of a transverse section of part of the gas exchange system. [Figure showing a photomicrograph] What describes the image?
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Athin inner layer of ciliated epithelial cells on top of a layer containing cartilage, supported by elastic fibres
Bvery thin epithelial lining with walls containing elastic fibres, surrounded by many blood vessels
Can inner layer of ciliated epithelial and goblet cells on top of elastic fibres, supported by an outer layer consisting of cartilage
Dan inner layer of ciliated epithelial and goblet cells on top of loose tissue with mucous glands, supported by a continuous ring of cartilage
✓ Correct answer
C: an inner layer of ciliated epithelial and goblet cells on top of elastic fibres, supported by an outer layer consisting of cartilage
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