The uterine lining creates a place for the fertilized egg to attach to in the uterus. Once the egg has attached to the uterine lining, it begins to grow. The lining also helps deliver nutrients to the developing fetus.
During Menstruation. The uterine lining sheds to prepare the uterus for pregnancy. It's due to the drop in estrogen and progesterone.
The uterus lining will come loose and a mentral cycle will begin.
to prepare the uterus to receive any fertilized eggs
The lining of the uterus breaking apart is the mucus lining that is usually formed so as to create a conducive environment for a fertilized egg to develop. If the ovum is not fertilized, the thick lining breaks apart which is what causes menstruation.
Pregnancy occurred.
The lining of the blood passing out of the vagina is known as a woman's monthly period. It is natures way to strip the old lining of the Uterus that failed to be needed on the woman becomes pregnant. The lining is rebuilt (renewed) to prepare for a possibly future pregnancy.
The blood lining of the uterus gradually thickens during a woman's menstrual cycle in order to be prepared to receive the fertilized egg. This lining will shed during the menstrual period if no fertilized egg has implanted.
Every month, the uterus prepares for the possibility of pregnancy, so if nothing happens, the uterus sheds the lining and passes out of the body.
To prepare for any fertilized eggs XD
The hormone progesterone in the corpus luteum will prepare the uterus for pregnancy.
Biologically, it is said that in menstruation the uterus 'weeps', as there is no pregnancy. The lining of the uterus is shed in the menstruation. Uterus is ready to have fresh lining of the uterine wall through next menstrual cycle.
Menstruation is one of the phases of the menstrual cycle, whereas the menstrual cycle is the entire reproductive system. During the menstrual cycle an egg is released and to prepare for possible pregnancy the uterus lining plumps-up, if pregnancy doesn't occur the uterus lining sheds (menstruation) so it can start afresh again next cycle.