The placenta is where the material between mother and child, like nutrients and oxygen, travel from one to another.
An embryo shares half of the genetic pattern of the mother. HOWEVER- you said HOST mother. In the case of a fertilized egg implanted in a mother that did NOT donate the egg, then there is no genetic relation between embryo and host mother.
It never occurs, direct blood and nerve connections between the mother and the embryo never occur.
The developing embryo is nourished by the yolk sack until implantation. Upon implantation the placenta begins to develop, the placenta acts as the fetal lung , it transports oxygen to the fetus and carbon dioxide away from the fetus via the umbilical cord. The placenta also provides stored carbs for the developing fetus.
Placenta
Because of the difference of the blood type between the mother and child.
A mammal embryo is the developing baby inside the mother.
I believe it is called an embryo
blood
the developing embryo is nourished by yolk
An embryo shares half of the genetic pattern of the mother. HOWEVER- you said HOST mother. In the case of a fertilized egg implanted in a mother that did NOT donate the egg, then there is no genetic relation between embryo and host mother.
The highly vascular structure that acts as a communication between the mother and the embryo is called the placenta.
The chorion is the outer membrane surrounding the embryo that is continuous with the placenta, the highly vascular structure that acts as a physical communication between the mother and the embryo.
It never occurs, direct blood and nerve connections between the mother and the embryo never occur.
The aorta, arteries, and the veins.
placenta which is between the mother and the embryo.
The developing embryo is nourished by the yolk sack until implantation. Upon implantation the placenta begins to develop, the placenta acts as the fetal lung , it transports oxygen to the fetus and carbon dioxide away from the fetus via the umbilical cord. The placenta also provides stored carbs for the developing fetus.
The chorion is one of the membranes that exist during pregnancy between the developing fetus and mother. It is formed by extraembryonic mesoderm and the two layers of trophoblast and surrounds the embryo and other membranes.