Medulla oblongata has

Options

A. Respiratory rhythm centre
B. Chemosensitive area
C. Pneumotaxic centre
D. (1) & (2)

Answer

To answer the question "Medulla oblongata has," we need to identify the structures or centers that are located within the medulla oblongata. Let's analyze the options provided step by step.

### Step 1: Understanding the Medulla Oblongata
The medulla oblongata is a crucial part of the brainstem that plays a vital role in regulating various involuntary functions, including breathing, heart rate, and blood pressure.

**Hint:** Remember that the medulla oblongata is part of the brainstem and is responsible for many autonomic functions.

### Step 2: Analyzing the Options
1. **Option 1: Respiratory Rhythmic Center**
- The respiratory rhythmic center is indeed located in the medulla oblongata. It is responsible for generating the basic rhythm of breathing.

**Hint:** Think about the centers that control breathing; the rhythmic center is essential for this function.

2. **Option 2: Chemo Sensitive Area**
- The chemo sensitive area is also found in the medulla oblongata. This area is sensitive to changes in the chemical composition of the blood, particularly carbon dioxide and oxygen levels, and helps regulate breathing accordingly.

**Hint:** Consider how the body monitors its internal environment; this area responds to chemical changes.

3. **Option 3: Pneumotaxic Center**
- The pneumotaxic center is not located in the medulla oblongata; it is found in the pons, which is situated above the medulla. The pneumotaxic center helps regulate the rate and pattern of breathing but is not part of the medulla.

**Hint:** Recall the anatomical location of the pneumotaxic center; it is in the pons, not the medulla.

4. **Option 4: None of the Above**
- Since we have identified that options 1 and 2 are correct, this option is not applicable.

### Step 3: Conclusion
Based on the analysis of the options, the medulla oblongata has:
- **Respiratory Rhythmic Center (Option 1)**
- **Chemo Sensitive Area (Option 2)**

Thus, the correct answer is that the medulla oblongata contains both the respiratory rhythmic center and the chemo sensitive area.

**Final Answer:** Medulla oblongata has the respiratory rhythmic center and the chemo sensitive area.