Menstrual Cycle:-

• The reproductive cycle in female is called menstrual cycle.
• In human females menstruation is repeated at an average internal of about 28/29  days and the cycle of events starting form one menstruation.
• The first menstruation begins at puberty is call menarche. one ovum is released during the middle of  each menstrual cycle. The cycle starts with the menstrual phase and the menstrual flow lasts for 3-5 days. Lack of menstruation may be indicative of pregnancy. However, it may also be caused by stress, poor health, etc.
• The next phase is proliferative phase, in which primary follicles on the ovary grow to become fully mature graafian follicle simultaneously the enodmetrium of uterus regenerates through proliferation.
• both LH and FSH hormone levels attain maximum level during mid cycle called LH surge induces repture of graafian follicle and the release  of  ovum.
• The ovulatory  phase is followed by luteal phase.
• In luteal phase, the remaining parts of the graafian follicle transform as the corpus luteum. The corpus luteum  secretes large amounts pf progesterone, which is needed for the maintenance of enometrium, which  is required for implantation of fertilised ovum and other events of preganancy.
• In absence of fertilisation, the corpus luteum degenerates. This caused disintegration of endometrium leading to menstruation making a new cycle. Menstruation cycle ceases around 50 years of age,ie., menopause.