What are estrogens?

Explanation

### Step-by-Step Text Solution

1. **Definition of Estrogens**: Estrogens are a group of hormones that play a crucial role in the development and functioning of female reproductive systems.

2. **Nature of Estrogens**: Estrogens are classified as steroid hormones. This means they are derived from cholesterol and have a specific chemical structure that allows them to pass through cell membranes and bind to receptors inside cells.

3. **Source of Estrogens**: The primary source of estrogens in females is the Graafian follicles of the ovaries. These follicles are responsible for the production and secretion of estrogen during the menstrual cycle.

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