Phase of the menstrual cycle and female sex hormones

Phase of the menstrual cycle and female sex hormones.  Photo from http://creative.gettyimages.com

Menstrual cycle — it changes in a woman's genital area approximately equal intervals. The biological purpose of the menstrual cycle — preparation of the woman's body for a possible pregnancy.

What is the length of the menstrual cycle?

The normal length of the menstrual cycle is 21 to 35 days. Menstrual cycle begins counting from the first day of bleeding.

The phases of the menstrual cycle and hormones, their regulatory

The menstrual cycle is divided into two phases, between which ovulation occurs.

The first phase is called the follicular. It is in this phase of developing follicle from which the egg is released, which can then turn into a developing fetus, and finally a baby. It begins on the first day of menstruation (menstrual bleeding) and ends when ovulation occurs. It takes about half of the cycle. Special cells that produce hormones phase estrogen. Throughout the follicular phase of the menstrual cycle of a woman's body basal temperature is usually kept below 37 degrees. The temperature needs to know the exact moment of ovulation — the time of ovulation basal temperature will drop sharply.

The next phase of the menstrual cycle — luteal, or luteal phase. The corpus luteum is formed in the ovary, the egg came out on the spot. This phase occurs immediately after ovulation and lasts as long as a yellow thing, that is, on average, about 12-14 days. The main task at this stage — to maintain the balance of the hormones estrogen and progesterone, which allocates the corpus luteum to prepare the body for a possible pregnancy. In this phase, the basal body temperature can be kept at 37 degrees, and then, before the onset of menses (menstrual bleeding), plummet.

Ovulation— Exit ripe (ready to fertilize) the egg from the follicle into the abdominal cavity with subsequent promotion through fallopian tubes to the uterus itself. In a woman's body at the time of puberty is stored about 300-400thousands of eggs. They are all located in the ovaries at birth, and laid in the womb. The first ovulation occurs slightly later than the onset of puberty, the last — after the extinction of menstrual function during menopause. During pregnancy ovulation also not the case, however, after the baby is born, it is restored.

Determine the time of ovulation are interested mainly those women who want to become pregnant, since the possibility of pregnancy exists only on certain days: 3-4days prior to ovulation, during ovulation and1-2days thereafter.

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