Summary of El ciclo menstrual

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The menstrual cycle is divided into three phases: flow, follicular, and luteal. Menstrual bleeding occurs during the flow phase, and changes in the ovaries due to hormonal fluctuations occur during the follicular phase. The luteal phase lasts for about two weeks, during which time the ovaries secrete progesterone and the lining of the uterus thickens.

• 00:00:00 The menstrual cycle typically lasts 28 days, but can vary from 23 to 35 days. The cycle can be divided into three phases: flow, follicular, and luteal. The first day of the menstrual cycle counts from the beginning of the flow. Menstrual bleeding occurs during this phase. The shedding of cells and mucous produces fluids. The epithelial cells covering the uterus in this phase also degenerate. The menstrual cycle then enters the follicular phase, where changes occur in the ovaries due to hormonal fluctuations. For example, in the first day of the menstrual cycle, when levels of estrogen are low, the anterior lobe of the pituitary gland begins to increase production of LH and FSH. This stimulation causes the maturation of a few follicles in the ovary, and then the cells in the follicles start to produce estrogen and a small amount of progesterone each. Eventually, only one follicle in development will grow. This growth-containing follicle continues to secrete estrogen, keeping low levels of LH and FSH. The follicular phase lasts for about two weeks, and during this time, changes occur in the ovaries due to rising levels of estrogen. This includes the development of a few mature follicles