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Question

If the CO2 concentration in the blood increases, the rate of breathing will

A
Decrease.
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B
Have no effect.
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C
Increase.
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D
Depends on the individual.
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Solution

The correct option is C Increase.
  • The level of CO2 usually drives the breathing rate. If the level of CO2 in blood increases by 10%, the rate of breathing almost doubles.
  • When the CO2 dissolves, it combines with the water in the blood to form carbonic acid. As this acid builds up, it decreases the pH of the blood.
  • This pH change is detected by the respiratory center i.e., medulla oblongata and speeds up breathing rate in order to get rid of the extra CO2. Option C is correct.

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