Final answer:
LH (luteinizing hormone) causes a mature follicle to release an ovum during ovulation. The corpus luteum produces progesterone.
Step-by-step explanation:
The surge of LH (luteinizing hormone) causes a mature follicle to release an ovum during the process of ovulation. The LH surge stimulates a change in the granulosa and theca cells in the follicle, transforming it into a structure called the corpus luteum. The corpus luteum then produces large amounts of the hormone progesterone.