Give main functions of progesterone.

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Nature of Progesterone:**
- Progesterone is classified as a steroid hormone. This means it is derived from cholesterol and has a specific structure that allows it to interact with cellular receptors.

2. **Determine the Source of Progesterone:**
- The primary source of progesterone in the body is the corpus luteum, which is a temporary endocrine structure in the ovaries that forms after ovulation.

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