Describe4 marksStandard
The trachea and bronchi are lined with a layer of cells that includes ciliated epithelial cells and goblet cells. Describe how these cells work together to protect the gas exchange system from damage.
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.
More Gas exchange questions
- 4 marks · The photomicrograph shows a transverse section through the wall of a bronchus. Describe the distribution and function of each of the…
- 4 marks · The alveoli in human lungs are lined with squamous epithelium. Describe the features of this epithelium that make it well adapted for…
- 5 marks · A student looks at transverse sections of a human trachea and a bronchiole. The trachea wall contains C-shaped rings of cartilage and a…
- 4 marks · Describe the structural features of the squamous epithelium lining the alveoli that are adapted for efficient gas exchange.
- 4 marks · A student examines a stained section of lung tissue under a light microscope. They observe thin-walled alveoli lined with a single layer…
- 4 marks · Describe the roles of ciliated epithelial cells and goblet cells in maintaining the health of the gas exchange system.
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