Select the option that correctly describes the location and function of a respiratory centre.

Options

A. Pneumotaxic centre - Pons - Reduces the duration of inhalation
B. Respiratory rhythm centre - Cerebellum -Establishes the basic respiratory rhythm
C. Apneustic centre - Midbrain - Sends stimulatory impulses to the inspiratory centre
D. Expiratory centre - Medulla - Stimulates contraction of diaphragm

Answer

To solve the question regarding the location and function of the respiratory center, we will analyze each option provided and determine which one accurately describes both aspects.

### Step-by-Step Solution:

1. **Identify the Respiratory Centers**: We need to look at the different respiratory centers mentioned in the options: pneumotoxic center, respiratory rhythm center, apneustic center, and expiratory center.

2. **Evaluate the Pneumotoxic Center**:
- **Location**: The pneumotoxic center is located in the pons.
- **Function**: Its function is to reduce the duration of inhalation. This is a correct statement.
- **Conclusion**: This option is a correct match.

3. **Evaluate the Respiratory Rhythm Center**:
- **Location**: The statement claims it is located in the cerebellum, but this is incorrect. The respiratory rhythm center is actually located in the medulla oblongata.
- **Function**: It is said to establish the basic respiratory rhythm, but its primary role is to control breathing, which is a broader function than just establishing rhythm.
- **Conclusion**: This option is incorrect due to both the wrong location and the misleading function.

4. **Evaluate the Apneustic Center**:
- **Location**: The statement claims it is located in the midbrain, which is incorrect. The apneustic center is located in the lower pons.
- **Function**: It is said to send stimulatory impulses to the inspiratory center, which is true, as it does help stimulate the inspiratory muscles.
- **Conclusion**: This option is incorrect due to the wrong location.

5. **Evaluate the Expiratory Center**:
- **Location**: The statement claims it is located in the medulla, which is correct.
- **Function**: It is said to stimulate the contraction of the diaphragm, but the expiratory center primarily controls forced exhalation, not diaphragm contraction.
- **Conclusion**: This option is incorrect due to the misleading function.

6. **Final Conclusion**: The only correct option is the pneumotoxic center, which is located in the pons and reduces the duration of inhalation.

### Answer:
The correct option that describes the location and function of a respiratory center is: **Pneumotoxic center - Located at pons and reduces the duration of inhalation.**

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