How many activities from the following are controlled by the hypothalamus ?
Body temperature, respiration, cardiovascular reflexes, secretion sexual drive.

Options

A. Two
B. Three
C. Four
D. Five

Answer

To solve the question of how many activities are controlled by the hypothalamus from the given options, we can break down the activities one by one:

1. **Body Temperature**: The hypothalamus plays a crucial role in thermoregulation. It detects changes in body temperature and initiates responses to maintain homeostasis. Therefore, this activity is controlled by the hypothalamus.

2. **Respiration**: The hypothalamus is involved in the regulation of respiration. It can influence the respiratory rate and depth in response to various stimuli, such as changes in carbon dioxide levels. Thus, respiration is also controlled by the hypothalamus.

3. **Cardiovascular Reflexes**: The hypothalamus helps regulate cardiovascular functions, including heart rate and blood pressure, by sending signals to the autonomic nervous system. Therefore, cardiovascular reflexes are controlled by the hypothalamus.

4. **Secretion of Sexual Drive**: While the hypothalamus does influence sexual behavior and drives through the release of certain hormones, the direct secretion of these hormones is primarily managed by the pituitary gland. Thus, this activity is not directly controlled by the hypothalamus.

Now, let's summarize the activities controlled by the hypothalamus:

- **Controlled by Hypothalamus**: Body temperature, respiration, cardiovascular reflexes (3 activities)
- **Not Controlled by Hypothalamus**: Secretion of sexual drive (1 activity)

Thus, the total number of activities controlled by the hypothalamus is **3**.

**Final Answer**: 3 activities are controlled by the hypothalamus.

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