Answer:
The ruptured Graafian follicle
transform into the corpus luteum and secretes large amounts of progesterone
which is essential for the maintenance of the endometrium. Such anendometrium
is required for the implantation of fertilized ovum (blastocyst) and other events
of pregnancy.
That's why corpus luteum in pregnancy
has a long life. But in the absence of fertilization, maintenance of
endometrium is not required. Therefore, corpus luteum degenerates within10-12
days.
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