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

Options

A. slow and deep
B. faster and deep
C. shallower and slow
D. there is no effect on breathing

Explanation

To solve the question "When CO₂ concentration in the blood increases, breathing becomes," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding CO₂ Concentration**: When the concentration of carbon dioxide (CO₂) in the blood increases, it indicates that the body is producing more CO₂ than it is expelling.

2. **Effect on Blood pH**: An increase in CO₂ levels leads to a decrease in the pH of the blood, making it more acidic. This change in pH is crucial as it signals the body to take action.

3. **Role of Chemoreceptors**: The body has specialized sensors called chemoreceptors that detect changes in CO₂ levels and blood pH. These chemoreceptors are primarily located in the brain and in the arteries.

4. **Activation of the Respiratory Center**: When the chemoreceptors sense higher CO₂ levels and lower pH, they send signals to the respiratory center in the brain (specifically the medulla oblongata) to respond to this change.

5. **Increase in Breathing Rate**: In response to the signals from the chemoreceptors, the respiratory center increases the rate and depth of breathing. This is a compensatory mechanism to expel the excess CO₂ from the body.

6. **Outcome**: As a result, breathing becomes faster and deeper, allowing the body to exhale more CO₂ and take in more oxygen (O₂).

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

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