The woman dies and the body consumes it self
The uterine lining builds-up in preparation for fertilization so that the zygote/embryo can implant itself into the uterine lining and then develop into a baby. Menstruation only takes place when fertilization doesn't take place, this occurs so the uterine lining is shed and can start a fresh next cycle so it can be ready for pregnancy again. If the uterine lining were to break down after fertilization a zygote/embryo wouldn't be able to implant itself or it would result in miscarriage.
It was thought that hCG was not produced until the baby implants into the uterine lining, but later research has shown that it appears to be produced soon after fertilization. More sensitive tests are picking up the hormone several days after conception.
The hormone secreted by the ovaries that encourages the rebuild of the uterine lining is estrogen. This hormone plays a crucial role in the menstrual cycle, stimulating the thickening of the uterine lining in preparation for potential implantation of a fertilized egg.
the ovaries
Progesterone
For women, the uterine lining sheds, in the physiological term of menstruation. In rabbits, nothing happens. They just keep going in and out of heat until fertilization does occur. The same goes for cows and heifers.
The uterine lining builds-up in preparation for fertilization so that the zygote/embryo can implant itself into the uterine lining and then develop into a baby. Menstruation only takes place when fertilization doesn't take place, this occurs so the uterine lining is shed and can start a fresh next cycle so it can be ready for pregnancy again. If the uterine lining were to break down after fertilization a zygote/embryo wouldn't be able to implant itself or it would result in miscarriage.
No, the uterus does not begin growing until after the embryo implants in the uterine lining.
It attaches to the uterine lining.
Breaks down
breaks down
Hopefully it implants to the uterine lining and grows into a fetus
As the follicle grows it produces certain hormones which reactive uterine wall to become thickened and to be supplied with a lot of blood. This change is a kind of preparation of the uterus to receive the fertilized egg and to provide for the development of the future embryo
You have the proliferative phase before the ovulation. After the ovulation you get the secretary phase. Here the glands becomes tortuous. The uterine lining becomes thick. This happens under the influence of both oestrogen and progesterone hormones.
The menstrual cycle is a series of hormonal changes in which an egg matures and is released and the uterine lining thickens so that the egg, if fertilized, can implant in it. Menstruation happens when the uterine lining sheds because no fertilized egg has implanted.
Menstruation is what happens when a woman doesn't get pregnant - after ovulation the uterine lining builds-up in preparation for possible pregnancy, if a woman doesn't get pregnant then menstruation occurs to shed the uterine lining so it can start fresh next cycle. During pregnancy the uterine lining is busy keeping the growing embryo/fetus safe, and women no longer ovulate.
It implants into the uterine lining and begins its long journey to becoming a baby!