Unit 11 · Gas Exchange in Humans
Question Bank
Cambridge IGCSE Biology 0610 · 30 questions
Q16Gas Exchange in Humans
Why does breathing rate increase during exercise?
(a)To cool the lungs
(b)Higher CO2 in blood is detected by the brain
(c)The diaphragm gets tired
(d)Less oxygen is needed
Correct answer: (b) Higher CO2 in blood is detected by the brain
Explanation: The brain responds to rising CO2 concentration by increasing rate and depth of breathing.
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