Menstruation is one of the most important parts of the menstrual cycle. So, from school textbooks of biology it is known that the duration of the menstrual cycle is 28 days. However, it really is too generalized figure, since most often it is 26-35 days. The duration of each loop is counted from the first day of menstruation until the last day before the beginning of the next. It is also important to note that when it starts the girls for the first time is evidence that their body is prepared for reproduction. Most often this occurs before 14 years of age, but in some cases it is and in 17.
Many believe menstruation is only necessary in order to rid your body of excess blood, or to purify the body. However, in reality the process is more complex. So, in essence, menstruation is the rejection of the female body thickened layer on the mucous membrane of the uterus, which is accompanied by bleeding.
Inside the uterine cavity is covered in a layer of the endometrium, which is influenced by the different periods of the menstrual cycle. Thus, in the first half of the cycle under the influence of hormone called estrogen, developing follicle. At this time the endometrium is in the process of active growth, to prepare for acceptance of a fertilized egg. When the follicle Matures, it ruptures, releasing the egg which then moves to the fallopian tube. This process is called ovulation.
After ovulation becomes active another hormone – progesterone. Under its influence, the endometrium of the uterus ceases to grow, and things start to change secretory nature. In this cycle if conception has not occurred after 12 to 14 days, the progesterone level falls sharply, which exfoliate the upper layers of the mucous membrane of the uterus, thins the blood vessels and starts bleeding, with impurities of secretory secretions of the uterus. Its main function is to clean the uterus from the endometrial layer, which was ready to take the egg, but then started to flake off and also give the opportunity to develop a new education.
Advice 2: Why the need for hymen
The hymen was given to each woman with specific goals. It is a kind of protective function that protects the sexual organs from the penetration of fungi, infections and other unpleasantness which receptive young age.
The hymen is a connective membrane, a fold of mucous membrane, which is located between the cavity and the vestibule of the vagina. Hymen covers the entrance to the vagina. The hymen has small holes of various shapes and sizes. This is the only body that never changes size from birth. There are several varieties of hymen: annular, tubular, keeled, lunate, and gubavica Velikobritaniya. At first intercourse occurs it may rupture from the hymen are only generalnie papillae. If a tight hymen, you may experience about vaginismus. There are times when a virgin pleura remains intact after several sex acts (in stretchability or anatomical features).
The hymen does a fairly utilitarian function in a women's body. She plays the same role as the lips form the border between the internal and the external environment. Particularly important is the preservation of the hymen before the first menstruation. The body of a teenager not yet able to deal with different microorganisms and bacteria that enter from the outside into the vagina. The hymen (hymen) is rarely solid, but still perform its protective function. At the onset of menstruation, the body begins to gradually become female, produces hormones that the vagina and provide protection from the external environment and the immune system.
The moral value of virginity in the historical periods was estimated in different ways. The peoples who were in the primitive stage of development, virginity was perceived as sexual unattractiveness. In Ancient Greece it was considered normal, if a little girl was involved in sexual games adults or teenagers. Sexual emancipation was considered an everyday concept that absolutely does not bother anyone early sexual debut.
There was the concept of virginity only for the priestesses of the goddess of the hearth Vesta. If a vestal lost her virginity, she was buried in the ground alive. In the first century BC, the law forbade the execution of an innocent girl. The executioner before the execution, was obliged to take her virginity.
In some European countries, virginity symbolizes the still unopened rosebud. In the Netherlands, the girl that saved before the wedding, virginity, wore an apron with an embroidered rose Bud in a certain place. The hymen has long been valued not as a way to maintain health, and was considered a prerequisite for marriage. A blood-stained sheet after the first night showed with genuine pride to others. Ahead of time the disgraced girls were punished by their own fathers, brothers and uncles.