Biology for IGCSE & O level - Gas Exchange In Humans (Section 1 - No. 5)
What is the primary stimulus for increasing the rate and depth of breathing during exercise?
Increased oxygen levels in the blood.
Increased carbon dioxide levels in the blood.
Decreased heart rate.
Decreased blood pressure.
Explanation
Increased carbon dioxide levels in the blood trigger the brain to increase breathing rate and depth to eliminate the excess CO2.
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