Define ovulation

Explanation

**Step-by-Step Solution:**

1. **Understanding the Menstrual Cycle**: The menstrual cycle typically lasts about 28 days and consists of several phases, including menstruation, the follicular phase, ovulation, and the luteal phase.

2. **Phases of the Cycle**: The cycle begins with menstruation, followed by the follicular phase, which lasts from day 1 to day 13. During this phase, follicles in the ovaries develop, leading to the maturation of an ovum.

3. **Follicle Development**: As the follicular phase progresses, primary, secondary, and tertiary follicles develop, culminating in the formation of the Graafian follicle, which is the largest and fully matured follicle containing the ovum.

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