Biology for IGCSE & O level - Gas Exchange In Humans (Section 1 - No. 38)
What causes the increase in the rate and depth of breathing during exercise?
Decreased blood pH.
Increased levels of oxygen in the blood.
Decreased levels of carbon dioxide in the blood.
Increased muscle contraction.
Explanation
The increased amount of carbon dioxide increases the body’s need for oxygen, which causes the breathing rate to increase.
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