CAIE A Level Biology 9700 · Gas exchange
The table below lists four tissues/structures found in the human gas exchange system. For each structure, describe its function in maintaining the health of the system or in facilitating gas exchange.
| Tissue/Structure | Function |
|---|---|
| Goblet cells | |
| Ciliated epithelium | |
| Cartilage | |
| Squamous epithelium |
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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