When `CO_(2)` concentration in blood increases breathing becomes

Options

A. (a) slow and deep
B. (b) faster and deeper
C. (c) shallower and slow
D. (d) there is no effect on breathing

Answer

### Step-by-Step Solution:

1. **Understanding the Relationship Between CO2 and Breathing**:
- When the concentration of carbon dioxide (CO2) in the blood increases, it affects the pH level of the blood. Higher CO2 levels lead to a decrease in pH, making the blood more acidic.

2. **Role of Chemoreceptors**:
- The body has specialized sensors called chemoreceptors, which detect changes in the levels of CO2 and pH. Central chemoreceptors located in the brain are particularly sensitive to these changes.

3. **Response to Increased CO2**:
- When CO2 levels rise and pH drops, the chemoreceptors signal the respiratory center in the brain to increase the rate and depth of breathing. This is a compensatory mechanism to help the body expel excess CO2 and take in more oxygen.

4. **Conclusion**:
- Therefore, as CO2 concentration in the blood increases, breathing becomes faster and deeper to restore normal levels of oxygen and carbon dioxide in the body.

5. **Selecting the Correct Option**:
- Given the options:
- A) Slow and deep - Incorrect
- B) Faster and deeper - Correct
- C) Shallow and slow - Incorrect
- D) No effect on breathing - Incorrect
- The correct answer is **B) Faster and deeper**.