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biology 0610printed 149 · PDF 149
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What increases the rate of diffusion of oxygen into red blood cells in the lungs?
Air leaving the lungs is saturated with water vapour.
B Air leaving the lungs still contains 16 % oxygen.
C_ Blood arriving in the lungs is saturated with oxygen.
D_ Blood is taken away from the lungs as it circulates.
9.
From the graph, when did the person begin a period of vigorous exercise after resting?
A
breathing rate/
breaths per minute
time / minutes
10.
Which route is taken by air passing into the lungs of a human?
A alveolus — trachea > bronchus
B_ bronchus > trachea > alveolus
C_ trachea — alveolus > bronchus
D
trachea — bronchus —> alveolus
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