box
9
Figure 12 shows exchange surfaces in the lungs.
Do not write
outside the
box
9
Figure 12 shows exchange surfaces in the lungs.
Figure 12
Oxygen
Cell at lung surface
Blood vessel
Red blood cell
(transports oxygen)
09
1
Explain how one feature shown in Figure 12 increases the rate of oxygen uptake
by the blood.
[2 marks]
Answers: 1
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Figure 12 shows exchange surfaces in the lungs.
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Figure 12 shows exchange surfaces in the lungs.
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