Describe4 marksStandard
Describe the functions of each of the following structures in the human gas exchange system:
- ciliated epithelium
- goblet cells
- smooth muscle
- elastic fibres
CAIE A Level Biology 9700 · Gas exchange
Gas exchange: describe question
How this question is marked
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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