During what phase of mensural cycle are primary follicles converted to Graafian follicles?

Options

A. Menstrual phase
B. Follicular phase
C. Luteal phase
D. secretory phase

Answer

To determine during which phase of the menstrual cycle primary follicles are converted to Graafian follicles, we can break down the menstrual cycle into its four main phases and analyze each:

1. **Menstrual Phase**: This is the first phase of the menstrual cycle, characterized by the shedding of the uterine lining and bleeding. During this phase, the primary follicles are still in their immature form, and no conversion to Graafian follicles occurs.

2. **Follicular Phase**: Following the menstrual phase, the follicular phase begins. This phase is crucial for the maturation of follicles. During this time, the primary follicles undergo development and maturation, stimulated by hormones such as Follicle Stimulating Hormone (FSH). As the phase progresses, these primary follicles develop into Graafian follicles, which are mature and ready for ovulation.

3. **Ovulation Phase**: This phase occurs when the mature Graafian follicle releases an egg (ovum) into the fallopian tube. This is not the phase where conversion occurs; rather, it is the culmination of the follicular phase.

4. **Luteal Phase**: Following ovulation, the luteal phase occurs. In this phase, the ruptured Graafian follicle transforms into the corpus luteum, which secretes hormones like progesterone. This phase does not involve the conversion of primary to Graafian follicles.

Based on this analysis, the correct answer is that primary follicles are converted to Graafian follicles during the **Follicular Phase** of the menstrual cycle.