Question

When CO₂ concentration in blood increases breathing becomes:

• A. here is no effect on breathing
• B. shallower and slow
• C. faster and deeper
• D. slow and deep

Answer 1

The correct option is C

faster and deeper

The correct option is C

Explanation of the correct option:

1. The increase in CO₂ concentration in the blood increases the rate of breathing.
2. This increase in CO₂ brings about a good change in the pH of the blood.
3. This change could be detected by chemoreceptors of the medulla oblongata of the hindbrain which is also a regulatory centre for respiration.
4. The respiratory centre increases the rate of respiration to exhale extra carbon dioxide and inhale more oxygen.

Final Answer: When CO₂ concentration in blood increases breathing becomes faster and deeper.