Which cells secrete testosterone in man?

Explanation

**Step-by-Step Solution:**

1. **Understanding Testosterone**: Testosterone is a vital hormone in males, often referred to as the primary male sex hormone. It plays a crucial role in the development and maintenance of male reproductive structures and secondary sexual characteristics.

2. **Role of the Hypothalamus**: The process of testosterone secretion begins in the hypothalamus, which is a region of the brain that regulates various bodily functions, including hormone release.

3. **Signal to Anterior Pituitary**: Upon receiving the appropriate signals, the hypothalamus sends a signal to the anterior pituitary gland. This gland is responsible for releasing several hormones that regulate other endocrine glands.

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