implantation
Progestrone causes the uterine lining to thicken in preparation of a fertilized egg. If no egg is fertilized, the thick lining is shed as a menstrual cycle.
The fertilized egg is implanted into the uterine lining.
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.
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.
Menstruating is the uterus basically not being pregnant and therefor getting rid if the uterine lining. When pregnant there is a fertilized egg and the uterus will protect it with the uterine lining.
It embeds itself in the uterine lining, and if it is fertilized, it will stay there for the pregnancy term.
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.
Progesterone levels rise after ovulation to protect the fertilized egg and to prevent the uterine lining from shedding.
The answer to your question is a zygote. From there, it develops to an embryo and a foetus. Happy science!!!
If the egg is not fertilized during ovulation then it is comes to rest in the fallopian tubes where it is reabsorbed into the body. Following this a woman will menstruate to shed the uterine lining.
The interior uterine lining is called the endometrium. The thickness of the endometrium varies throughout the menstrual cycle which is influenced by the hormones estrogen and progesterone.
menstruation