Monthly Cycle occurs in three phases:-

Menstruation cycle occurs in three phases:-

The follicular phase

This phase begins at day 1 of the menstrual bleeding and ends at day 14 when the process of ovulation begins. The pituitary gland stimulates the follicle stmulating hormone (FSH) to ovulate again. One of the follicles mature and develops a single mature egg. During this phase, "Estradiol' (The predominat estrogen) increases and is at peak resulting in the thickening of the 'endometrium' (the lining of the uterus) and enriches it with blood (after menstruation). High levels of estrogen steimulated the production of Gonadotrop-releasing hormone (GnRh), Which in turn stimualtes the pituitary gland to secrete the luteinizing hormone (LH). Increases levels of Lh, Rases the levels of testosterone thereby stimulating and increasing  the sex drive. this is the most fertile time in the entire cycle. 

The Ovulatory Phase 

This phase is marked by only one day, which is day 14. The matured egg is released into fallopian tube where the fertilization takes places, if the sperms are present FSH and LH rach their peak two days before which causes the release of the mature egg. After releasing the egg, the follicles seal themselves to from the corpus luteum. if the egg is not fertilized within 24 hours, it disintegrates. 

The Luteal  Phase 

This phase lasts from day 15 to 28 Fish and LH drop in their significant levels after the egg has been released. Corpus luteum starts secreting progesterone that prevents the endometrial lining from being shed. if the egg gets fertilised, progesterone continues to be secreted and if not fertilised the corpus luteum disintegrates, causing the drop in the production of progesterone and shedding of the endometrial linning. it aslo results in reduced production of estradiol. This phase experiences a drop in hormones causing a sort of imbalance, which explains the mood swings before the menstruation starts. cortisol levels are said to increase during this phase as the body feels stressed over the loss  of a new life. 

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