Define menstrual cycle. Differentiate between follicular phase and secretory phase of a menstrual cycle.

Explanation

### Step-by-Step Solution:

1. **Definition of Menstrual Cycle**:
The menstrual cycle is a series of physiological changes that occur in the female reproductive system, primarily aimed at preparing the body for potential pregnancy. It typically lasts about 28 to 29 days and involves the interplay of hormones that regulate the growth and release of eggs from the ovaries, as well as the preparation of the uterine lining for implantation.

2. **Phases of the Menstrual Cycle**:
The menstrual cycle is divided into four main phases:
- Menstrual Phase
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