Q. In Mammalian embryo, which among the following is the outermost membrane that serves as exchange between embryo and environment?
Answer: Chorion
Notes: Both the chorion and the placenta (if given in options) are correct answers. The chorion is the outermost membrane that surrounds the developing embryo and serves as an exchange between the embryo and the environment. It is part of the fetal membranes, which also include the amnion, the yolk sac, and the allantois. The chorion is located just beneath the amniotic sac and is in contact with the maternal tissue.
The placenta is also a temporary organ that is formed during pregnancy to provide nourishment and oxygen to the developing fetus and to remove waste products. It is located inside the uterus and is attached to the fetus by the umbilical cord. The placenta is formed from the same cells as the embryo and is therefore considered part of the fetal tissue. It is composed of several layers of cells and blood vessels that allow for the exchange of nutrients, gases, and waste products between the mother and the fetus. The placenta plays a vital role in the development and health of the fetus during pregnancy.
In summary, the chorion is the outermost membrane that surrounds the developing embryo, while the placenta is a temporary organ that provides nourishment and oxygen to the fetus and removes waste products. Both the chorion and the placenta are important for the exchange of substances between the mother and the fetus during pregnancy.
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