The uterine lining builds-up following ovulation in preparation for possible pregnancy, to allow the zygote to implant and nourish the growing 'baby'. If pregnancy doesn't occur the drop in progesterone triggers the uterus lining to break down, this is called menstruation.
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During menstruation, the lining of the uterus (endometrium) breaks down and sheds along with blood, cells, and tissue through the vagina. This process is a natural part of the menstrual cycle and occurs monthly in females of reproductive age who are not pregnant.
Hormone levels drop and the uterus lining starts to break down during a woman's menstrual cycle. This typically occurs after ovulation when there is no pregnancy, leading to the shedding of the uterine lining in the form of a menstrual period.
The lining of the uterus breaks down and is shed during menstruation if fertilization does not occur.
The uterus lining breaks down during menstruation, which occurs approximately every 28 days in women who are not pregnant. The breakdown of the lining is part of the menstrual cycle, which involves shedding of the endometrium in preparation for a new cycle of ovulation.
After fertilization, the uterus lining provides nourishment and protection for the fertilized ovum. The ovum implants in the uterus lining, where it receives nutrients and support for development into an embryo.
After fertilization, the egg implants in the lining of the uterus. It can implant on any side of the uterus where the endometrial lining is thick enough to support pregnancy.