The name of the ovulated structure prior to fertilization

It is called the secondary oocyte

Explanation: I found the flashcards from quizlet

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?