The respiratory centre in meddulla may release motor impluses for faster breathing due to

Options

A. venous blood leaving it
B. arterial blood leaving it
C. venous blood entering into it
D. arterial blood entering into it

Answer

To answer the question regarding why the respiratory center in the medulla may release motor impulses for faster breathing, we can break down the reasoning step by step:

### Step-by-Step Solution:

1. **Understanding the Role of the Medulla Oblongata**:
- The medulla oblongata is a part of the brain that regulates vital functions, including breathing. It contains the respiratory center that controls the rate and depth of breathing.

2. **Identifying Triggers for Faster Breathing**:
- The respiratory center responds to various physiological changes in the body. One of the primary triggers for increased breathing rate is the level of carbon dioxide (CO2) in the blood.

3. **Analyzing the Options**:
- **Option A: Venous blood leaving it** - This option suggests that the blood leaving the medulla is affecting breathing. However, this is not the primary factor.
- **Option B: Arterial blood leaving it** - This option also does not directly relate to the respiratory control.
- **Option C: Venous blood entering into it** - While venous blood carries CO2, it does not directly stimulate the respiratory center.
- **Option D: Arterial blood entering into it** - Arterial blood carries oxygen and CO2, but the primary stimulus for increased breathing is related to CO2 levels.

4. **Correct Answer**:
- The correct answer is **Option A: Venous blood leaving it**. The increase in CO2 levels in venous blood can signal the respiratory center to increase the breathing rate to expel more CO2 and take in more oxygen.

5. **Conclusion**:
- The respiratory center in the medulla releases motor impulses for faster breathing primarily due to the increased levels of CO2 in the venous blood, which indicates that the body needs to expel CO2 and increase oxygen intake.