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

Options

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

Explanation

**Step-by-Step Solution:**

1. **Understanding CO2 Concentration in Blood:**
- When the concentration of carbon dioxide (CO2) in the blood increases, it indicates that the body is producing more CO2, which can happen during exercise or other metabolic activities.

2. **The Role of the Bohr Effect:**
- The Bohr effect explains how increased levels of CO2 affect the affinity of hemoglobin for oxygen (O2). Specifically, as CO2 concentration rises, the affinity of hemoglobin for O2 decreases. This means that hemoglobin is less likely to hold onto oxygen.

3. **Consequences for Oxygen Levels in Tissues:**
- With decreased affinity of hemoglobin for oxygen, less oxygen is transported to the tissues. As a result, the tissues may experience a lower oxygen level, which is critical for cellular respiration and energy production.

4. **Body's Response to Low Oxygen Levels:**
- To compensate for the low oxygen levels in the tissues, the body responds by increasing the rate and depth of breathing. This is an attempt to bring more oxygen into the lungs and subsequently into the bloodstream.

5. **Conclusion:**
- Therefore, when CO2 concentration in the blood increases, breathing becomes faster and deeper to ensure that adequate oxygen reaches the tissues.

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

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