Biology for IGCSE & O level - Gas Exchange In Humans (Section 3 - No. 25)
What is the relationship between breathing rate and carbon dioxide levels in the blood?
As carbon dioxide levels increase, breathing rate decreases.
As carbon dioxide levels increase, breathing rate increases.
There is no relationship between carbon dioxide levels and breathing rate.
Breathing rate is always constant.
Explanation
Increased carbon dioxide levels trigger an increase in breathing rate.
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