Select the set of medullary respiratory centers in Brain ?

Options

A. Chemo-sensitive area and respiratory rhythm center
B. Respiratory rhythm center and pneumotaxic
C. Chemo-sensitive area and pneumotaxic centre
D. Pneumotaxic centre and vomit centre .

Answer

To solve the question regarding the set of medullary respiratory centers in the brain, we will analyze each option provided and identify the correct answer step by step.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the set of medullary respiratory centers in the brain. The medulla oblongata is a crucial part of the brain that controls various autonomic functions, including respiration.

2. **Identify Key Centers**:
- **Respiratory Rhythm Center**: This center is located in the medulla and is responsible for generating the basic rhythm of breathing.
- **Chemosensitive Area**: This area is also located in the medulla, adjacent to the respiratory rhythm center, and is sensitive to changes in carbon dioxide and hydrogen ion concentrations in the blood.

3. **Evaluate the Options**:
- **Option 1: Chemosensitive Area and Respiratory Rhythm Center**: This option includes both centers located in the medulla. Therefore, this option is **correct**.
- **Option 2: Respiratory Rhythm Center and Pneumotaxic Center**: The pneumotaxic center is located in the pons, not the medulla. Thus, this option is **incorrect**.
- **Option 3: Chemosensitive Area and Pneumotaxic Center**: Again, the pneumotaxic center is not in the medulla. Therefore, this option is **incorrect**.
- **Option 4: Pneumotaxic Center and Vomit Center**: The vomit center (or chemoreceptor trigger zone) is located in the medulla, but the pneumotaxic center is not. Thus, this option is **incorrect**.

4. **Conclusion**: The only correct option that includes both medullary respiratory centers is **Option 1: Chemosensitive Area and Respiratory Rhythm Center**.

### Final Answer:
**The correct set of medullary respiratory centers in the brain is Option 1: Chemosensitive Area and Respiratory Rhythm Center.**