because the capillaries contain used up oxygen whereas, the alveolus contains fresh oxygen we just breathed in
3 of 5
what happens to the concentration gradient during exercise
The gradient is steeper as more oxygen will be taken from the blood
4 of 5
why does oxygen move from the alveolus to the blood
oxygen goes from low high to low pressure on the concentration gradient the alveolus has higher concentration than the blood therefor the oxygen diffuses through.
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