What is menstrual cycle? Which hormones regulate menstrual cycle?

Explanation

### Step-by-Step Solution

1. **Definition of Menstrual Cycle**:
- The menstrual cycle is a natural process that occurs in the female reproductive system, characterized by cyclic changes in the uterine lining. It prepares the body for potential pregnancy each month.

2. **Phases of the Menstrual Cycle**:
- The menstrual cycle consists of several phases:
- **Follicular Phase**: This phase begins on the first day of menstruation and lasts until ovulation. During this time, the follicles in the ovaries mature, and the uterine lining thickens.
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