nutrition for fetus no blood mix thru mother and fueetus
ingestion
blood does not pass across the placenta
The mother experience hormonal changes
cleavage->gastrulation->implantation->formation of placenta->first labor
Implantation typically occurs in the wall of the uterus, where the embryo attaches and begins to grow. The placenta then forms from the outer layer of cells of the embryo and the uterine lining, facilitating the exchange of nutrients and waste between the mother and the developing baby.
The placenta is pushed out of the uterus
Yes, twins can share a placenta during pregnancy. This occurs when identical twins share a single placenta, while fraternal twins each have their own placenta.
fertilization zygote divides gastrulation placenta forms
After birth, the placenta and umbilical cord (often referred to as the "umbilicus") are expelled from the mother’s body during the third stage of labor. This process occurs naturally as the uterus contracts, helping to detach the placenta from the uterine wall. The umbilical cord, which connects the baby to the placenta, is usually clamped and cut shortly after the baby is born, separating the baby from the placenta. The placenta and remaining cord are then delivered, typically within a few minutes after the baby is born.
The final stage in the birth process is the delivery of the placenta, also known as the afterbirth. This occurs shortly after the baby is born, and it is important to ensure that it is fully expelled to prevent any complications.
The placenta is located at the lowest posterior part of the internal os. This usually occurs in placenta previa that can either be partially closed or completely closed.
Yes, twins can share a placenta during pregnancy. This occurs when identical twins develop from a single fertilized egg and share the same placenta.