Which centre is stimulated during increase in body temperature ?

Options

A. Anterior hypothalamus
B. Posterior hypothalamus
C. Limbic system
D. Red nucleus

Answer

To answer the question "Which centre is stimulated during an increase in body temperature?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Body Temperature Regulation**: The human body maintains a stable internal temperature, typically around 37 degrees Celsius. This process is crucial for proper physiological functioning.

2. **Identifying the Brain Region Involved**: The part of the brain responsible for regulating body temperature is the hypothalamus. More specifically, the posterior hypothalamus plays a key role in this regulation.

3. **Function of the Posterior Hypothalamus**: When the body temperature rises above the normal range, the posterior hypothalamus is stimulated. It detects the increase in temperature and initiates mechanisms to help cool the body down.

4. **Mechanisms of Cooling**: The posterior hypothalamus triggers responses such as sweating and increased blood flow to the skin. Sweating allows heat to be released from the body through evaporation, effectively lowering the body temperature.

5. **Conclusion**: Therefore, the centre that is stimulated during an increase in body temperature is the **posterior hypothalamus**.

### Final Answer:
The correct answer is the **posterior hypothalamus**.

---