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Which of the following listed respirator...

Which of the following listed respiratory centres in the brain can reduce the expiratory duration upon stimulation?

A

Medullary inspiratory centre

B

Pneumotaxic centre

C

Apneustic centre

D

Chemosensitive centre

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding which respiratory center in the brain can reduce the expiratory duration upon stimulation, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Respiratory Centers**: - The brain has several centers that regulate breathing, including the medullary inspiratory center, pneumotaxic center, agnostic center, and chemosensitive center. 2. **Identify the Function of Each Center**: - **Medullary Inspiratory Center**: Primarily responsible for initiating inspiration; does not specifically reduce expiratory duration. - **Pneumotaxic Center**: Located in the pons, it plays a crucial role in regulating the rhythm of breathing. It can limit the duration of inspiration, which indirectly affects the duration of expiration. - **Agnostic Center**: This term is not commonly used in the context of respiratory centers, so it may not be relevant. - **Chemosensitive Center**: Responds to changes in blood chemistry (like CO2 and O2 levels) but does not directly control the duration of expiration. 3. **Focus on the Pneumotaxic Center**: - The pneumotaxic center is known as the "switch-off" point for inspiration. When stimulated, it reduces the time spent in the inspiratory phase, thereby increasing the frequency of breathing and consequently reducing the expiratory duration. 4. **Conclusion**: - Based on the functions of these centers, the pneumotaxic center is the one that can reduce the expiratory duration upon stimulation. ### Final Answer: The correct answer is **B. Pneumotaxic Center**. ---
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