It is simply a lining of the uterus which gets larger throught the menstural cycle which the egg would sit in if you were pregnant. If you are not pregnant that month, the blood is released.
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Period blood comes from the shedding of the uterine lining, which builds up each month in preparation for a potential pregnancy. If pregnancy does not occur, the lining is no longer needed and is expelled from the body through the vagina during menstruation.
The blood from a period comes out of the vagina. The shedding of the uterine lining and blood occurs through the cervix and out of the vagina during menstruation.
Blood comes out through the vagina during menstruation.
Menstrual blood exits the girl's body through the vagina during her period. The blood comes from the shedding of the uterine lining, which occurs monthly as part of the menstrual cycle.
The brown discharge that may come out during your period is usually old blood that has oxidized and is being expelled from the uterus along with the menstrual flow. This is normal and typically occurs at the beginning or end of your period.
During menstruation the blood comes out via your vagina. Blood comes out of the uterus, passes through the cervix, then exits via your vagina - if menstruating you really should know how this process occurs.