Biology for IGCSE & O level - Gas Exchange In Humans (Section 4 - No. 12)
Which of the following conditions would likely trigger an increase in breathing rate? (Select all that apply)
High levels of oxygen in the blood
High levels of carbon dioxide in the blood
Physical exercise
Resting comfortably
Explanation
Higher levels of CO2 and exercise increase the need for gas exchange, thus increasing breathing rate.
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