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The allantois membrane and which of these form the placenta?
The allantois membrane and the chorion form the placenta in mammals. The chorion is the outermost fetal membrane that encases the embryo and later fuses with the maternal tissue to form the placenta.
What are the three layer of membrane that make up the placenta?
Allantois, amnion, and chorion
What embryonic membranes has the placenta more or less put out of business?
the yolk sac and the allantois
What part of the egg acts as the placenta in mammals?
The allantois, yolk sac and part of chorion.
What part of the chicken egg acts as placenta in mammals?
The allantois, yolk sac and part of chorion.
What is the fetal membrane that forms the basis of the umbilical cord?
allantois
Describe how the placenta chorionic villi and allantois are functionally and structurally related?
. All three structures are involved in the transfer ofnutrients and waste products between the fetus andmother. Blood vessels originating from the allantois(one of the four embryonic membranes) extend intothe chorionic villi. The combination of the chorionicvilli and the portions of the uterine lining into whichthey extend is called the placenta.
A membrane rich in blood vessels?
Placenta
How amniotic sac and placenta alike?
are membrane that helps
The extraembryonic membrane that forms the fetal portion of the placenta is the?
The chorion.
Does the placenta grow from the mom or fetus?
The placenta is the nourishing membrane around a fetus that grows from the inside of the mom's uterus. Your answer is, ". . . the mom . . ."
How do drugs taken by a pregnant women reach the fetus?
Some chemicals can cross the blood barrier between the uterus and the fetus and enter the umbilical cord. This is sometimes due to a high concentration of chemicals such as alcohol, or in heavy metal poisoning.
