Differentiate between major structural changes in the human ovary during the follicular and luteal phase of the menstrual cycle.

Explanation

To differentiate between the major structural changes in the human ovary during the follicular and luteal phases of the menstrual cycle, we can break down the changes that occur in each phase step by step.

### Step-by-Step Solution:

1. **Follicular Phase Overview**:
- The follicular phase begins on the first day of menstruation and lasts until ovulation.
- During this phase, several primary follicles in the ovary begin to mature.

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