Explain7 marksChallenge
Explain how the structure of the human gas exchange system enables efficient gas exchange. In your answer, refer to the path taken by an oxygen molecule from the trachea to the blood in a pulmonary capillary.
CAIE A Level Biology 9700 · Gas exchange
Gas exchange: explain question
How this question is marked
7 marks, so the mark scheme is looking for about 7 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
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- 4 marks · Describe how the structure of each of the following tissues in the human gas exchange system is adapted to its function: ciliated…
- 5 marks · An oxygen molecule enters the trachea during inhalation. Describe the pathway it takes to reach the blood in the pulmonary capillaries…
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