What helps to maintain a steep oxygen concentration gradient between the air in an alveolus and the blood?
1. Breathing in brings in a supply of air with a relatively high concentration of oxygen to the alveolus.
2. Blood flow brings blood with a relatively low concentration of oxygen to the alveolus.
3. The relatively low concentration of carbon dioxide in the alveolus results in the carbon dioxide leaving the red blood cell, allowing haemoglobin to combine with oxygen.
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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