• Ruptured Grafian follicles form the Corpus luteum.
• Corpus luteum produces progesterone and helps to maintain the endometrium lining, required for the implantation of embryo.
• However if fertilisation doesn’t happen then there is no need of endometrium lining.
• As in absence of fertilisation, endometerium is not required and the corpus luteum degenerates in 10-12 days.
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