Explain5 marksStandard
Explain how the distribution of cartilage and smooth muscle differs between the trachea and a bronchiole, and how these differences are related to the functions of these structures in the gas exchange system.
CAIE A Level Biology 9700 · Gas exchange
Gas exchange: explain question
How this question is marked
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
More Gas exchange questions
- 5 marks · A student examines a prepared slide of mammalian lung tissue under a light microscope. They observe numerous hollow sacs (alveoli) with…
- 5 marks · A student examines transverse sections of a trachea and a bronchiole under a light microscope. The trachea wall contains distinct C-shaped…
- 4 marks · The trachea and bronchi are lined with ciliated epithelial cells and goblet cells. Describe how these two cell types help to protect the…
- 7 marks · Explain how the structure of the human gas exchange system enables efficient gas exchange. In your answer, refer to the path taken by an…
- 7 marks · Describe the roles of ciliated epithelial cells and goblet cells in maintaining the health of the human gas exchange system.
- 6 marks · Describe how the structure of an alveolus and its associated blood capillaries is adapted to enable efficient gas exchange.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.