How does the menstruation?

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The menstrual cycle. How does the menstruation? After the egg is cooked ovulation will occur. Ovum will be arrested fimbriae infundi-bulum. If the egg is fertilized, there will be a pregnancy. However, if fertilization does not occur, menstruation will occur. Menstruation occurs every month and form a menstrual cycle length of approximately 28 days. 14 days of preparation for ovulation and endometrial preparation 14 days to receive a fertilized ovum.

At the end of the menstrual cycle, the hypothalamus secretes gonadotropin hormone (FSH-RH) to stimulate the anterior hipofisi secrete FSH (Follicle Stimulating Hormone). At the beginning of the next cycle, on day 14, the follicle will continue its development (oogenesis) is influenced by the hormone FSH. Once formed DeGraaf follicle (mature follicle) and produce the hormone estrogen. This developmental period is called follicular phase.

The hormone estrogen stimulates the anterior pituitary to secrete LH and FSH in inhibiting the formation of pituitary hormones. LH acts to stimulate ovulation, usually on day 14 of the menstrual cycle. Around the time of ovulation is called the estrus phase. LH also stimulates the empty follicle to form the corpus luteum.

The corpus luteum produces progesterone which serves to prepare the uterus to be occupied by embryo if fertilization occurs. This phase is called the luteal phase. Progesterone also serves to inhibit the formation of LH and FSH.

If fertilization does not occur, progesterone production begins to decline at day 26, the corpus luteum will shrink, eventually disappearing. This causes the lining of the endometrium shed at day 28. As a result, the so-called menstrual bleeding. Generally, menstruation occurs during one week. Then, the cell walls recovered, FSH is produced again and the cycle begins again. Advertisement