not sure what you mean by "which of these" but the umbilical cord connects the embryo to the mother.
umbilical cord
umbilical cord
The umbilical cord connects the embryo to the mother during pregnancy. It is responsible for transporting nutrients and oxygen from the mother to the fetus, as well as removing waste products.
When the embryo reaches the uterus, it will implant itself into the uterine wall. This process is crucial for the embryo to receive nutrients and oxygen from the mother's bloodstream and for the development of the placenta, which connects the embryo to the mother for nourishment and waste removal.
The emrbyo implants itself onto the wall of the womb - on the endometrium, cell duplication and division occurs, then the outer layer of the embryo generates the placenta which connects the baby to the mother.
The umbilical cord.
The umbilical cord.
The "Umbilical cord".
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.
After about a week from conception the zygote consists of over 100 cells. It then separates into two distinct mases. The outer cells form a shell that will become the placenta and the inner cells will become the embryo. First the outer cells must implant or embed themselves in the wall of the uterus. This occurs at about 10 days after conception. If implantation occurs the cells will grow and become an embryo and placenta. An umbilical cord forms and connects to the embryo's stomach and placenta so the embryo can get nourishment.
The embryo develops in the uterus of the mother.
Placenta is the organ that provides mechanical protection and nutritional support for the developing embryo. It connects the developing fetus to the uterine wall to allow nutrient and waste exchange between the mother and the fetus.