Know Your Menstrual Cycle

Ovum mature ovaries removed and arrested tassels on the funnel tube. If no sperm, then sperm fertilized ovum. Ovum is fertilized to form zygotes, then the zygote moves into the uterus.
If the ovum is fertilized sperm, tissue in the uterus has thickened walls and many vessels will be damaged and the whole resulting in menstruation.
Menstruation is also called menstrual bleeding that occurs entirely due to the inner wall of the uterus (endometrium), which contains many blood vessels. Endometrial lining is prepared to accept the attachment of the embryo. If there is no attachment of the embryo, then this layer will be shed, then the blood out through the cervix and vagina. The bleeding occurs periodically, the interval between menstrual periods to the next one is known by a single menstrual cycle.
Woman's menstrual cycles vary, but average around 28 days. The first day of menstruation is expressed as the first day of the menstrual cycle. This cycle consists of four phases, namely:
1. Menstrual phase
Menstrual phase occurs if the ovum is not fertilized sperm, so the corpus luteum to stop production of the hormones estrogen and progesterone. Estrogen and progesterone levels to drop, causing the release of ovum from the endometrium with endometrial torn and entirely, resulting in bleeding. Menstrual phase lasts approximately 5 days. The blood that came out during the period ranged from 50-150 milli-liter.
2. Pre-ovulatory phase
Pre-ovulatory phase is also called the phase of proliferation. What happens in this phase? Gonadotropin hormone liberator who issued the hypothalamus will stimulate the pituitary to release FSH. FSH stands for follicle stimulating hormone. FSH stimulate follicular maturation and stimulate the follicle to release the hormone estrogen.
The existence of estrogen causes the re-establishment (proliferation) endometrial wall. Increased estrogen levels also cause the cervix to remove the alkaline mucus. This mucus serves to neutralize the acidic conditions of the vagina that support the life of sperm.
3. Ovulatory phase
If a woman's menstrual cycle 28 days, ovulation occurs on day 14. Increased estrogen levels inhibit FSH expenditure, and pituitary LH release. LH stands for luternizing hormones. Increased levels of LH stimulates the release of a secondary oocyte from the follicle, this event is called ovulation.
4. Post-ovulatory phase
This phase lasted for 14 days before the next menstruation. Although the length of the menstrual cycle is different, post-ovulatory phase is always the same ie 14 days before the next menstruation. De Graaf follicles (follicles mature) that has been releasing the secondary oocyte will be crimped and the corpus luteum. The corpus luteum secretes hormones progesterone and still release the hormone estrogen, but not as much when shaped follicles.
Progesterone supports estrogen work to strengthen and grow the blood vessels in the endometrium as well as prepare the endometrium to receive the attachment of the embryo if fertilization occurs or pregnancy.
If no fertilization occurs, the corpus luteum corpus albikan will turn into a little secrete hormones, so that the levels of progesterone and estrogen is low. This situation led to the occurrence of menstruation and so on.