Final answer:
The important event that occurs in the apical surface of the follicle cell is ovulation, where the mature follicle bursts and releases the egg. The LH surge triggers the degradation of the ovarian wall and the release of the oocyte surrounded by granulosa cells into the peritoneal cavity. The LH surge also stimulates the transformation of the remaining granulosa and theca cells into the corpus luteum, which produces progesterone.
Step-by-step explanation:
The important event that occurs in the apical surface of the follicle cell is ovulation. Ovulation is the process in which the mature follicle bursts, releasing the egg from the ovary. The LH surge triggers the degradation of the ovarian wall and the release of the oocyte surrounded by granulosa cells into the peritoneal cavity. The LH surge also stimulates the transformation of the remaining granulosa and theca cells into the corpus luteum, which produces large amounts of progesterone.