Assertion : Pneumotaxic centre, located in the medulla region of the brain, moderates the respiratory rhythm centre.
Reason : Pneumotaxic centre controls the switch `'ON'` point of inspiration.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true and reason is not the correct explanation of assertion
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

To solve the question regarding the assertion and reason about the pneumotaxic center, we can follow these steps:

### Step 1: Analyze the Assertion
The assertion states that the pneumotaxic center is located in the medulla region of the brain and moderates the respiratory rhythm center.

- **Evaluation**: This statement is **false**. The pneumotaxic center is actually located in the pons region of the brain, not the medulla. The medulla contains the respiratory rhythm center, but the pneumotaxic center is responsible for regulating the rhythm of breathing and is located in the pons.

### Step 2: Analyze the Reason
The reason states that the pneumotaxic center controls the switch 'ON' point of inspiration.

- **Evaluation**: This statement is also **false**. The pneumotaxic center does not control the 'ON' point of inspiration; rather, it limits the duration of inspiration. It helps in the transition between inspiration and expiration, but it does not initiate the inspiration process.

### Step 3: Conclusion
Since both the assertion and the reason are false, the correct answer to the question is that both the assertion and the reason are false.

### Final Answer
Both the assertion and the reason are false.

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