A-LevelBiologyGas exchange9700/12 · Oct/Nov 2016 · Q341 Mark

A student made some labelled drawings of lung tissue using the high-power lens of a light microscope, but did not label two airways, P and Q. The drawing of the lining layer of P showed both ciliated cells and goblet cells, whilst the drawing of the lining layer of Q showed ciliated cells but very few goblet cells. What are airways P and Q?

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AP: bronchiole, Q: trachea

BP: bronchiole, Q: bronchus

CP: bronchus, Q: bronchiole

DP: trachea, Q: bronchus

✓ Correct answer

C: P: bronchus, Q: bronchiole

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2016 Paper 1 Variant 2, question 34.

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