When does FSH experience a sharp increase?

• A. During ovulation
• B. Before menstruation
• C. At the onset of puberty
• D. Just before ovulation

Answer: (D)

FSH, or follicle-stimulating hormone, typically experiences a sharp increase just before ovulation, a phase also known as the luteinizing hormone (LH) surge. This increase is crucial for the ovulatory process as it stimulates the growth and maturation of ovarian follicles, leading to the release of a mature egg. The surge in FSH, alongside LH, triggers the final maturation of the dominant follicle and ultimately results in ovulation.

Understanding the hormonal interplay during the menstrual cycle is key. After the follicular phase, when FSH initially promotes follicle growth, a pivotal switch happens just prior to ovulation, leading to an increase in FSH levels. This increase occurs slightly in advance of the LH surge, which is more prominently associated with the actual moment of ovulation.

The other choices relate to different stages in the menstrual cycle where FSH does not surge sharply. For instance, during ovulation, while LH surges, FSH does not experience the same increase. Similarly, before menstruation, FSH levels typically decline. At the onset of puberty, there is a gradual increase in FSH levels but not a sharp spike related to the cycles of ovulation. Therefore, understanding the timing and role of FSH in