Question

When $C{O}_2$ concentration in blood increases, breathing becomes

• A. Slow and deep
• B. Faster and deeper
• C. Shallower and slow
• D. There is no effect on breathing

Answer 1

The correct option is B Faster and deeper

The increase in carbon dioxide concentration in blood increases, the rate of breathing. The increase in carbon dioxide brings a remarkable change in the pH of the blood. This change is sensed by the chemoreceptors of the medulla oblongata of the hindbrain which has a regulatory centre for respiration. The respiratory centre increases the rate of respiration to exhale the extra carbon dioxide and inhale more oxygen.

So, the correct answer is 'Faster and deeper'.