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CBSE Class 10 Answered

placenta
Asked by amithkumarv | 28 Jan, 2010, 08:29: PM
answered-by-expert Expert Answer

The placenta is an oval or discoid spongy structure embedded in the uterine wall that connects the fetus to the mother. It enables the foetus to carry out nutrient uptake, waste elimination and gas exchange via the mother's blood supply. 

Placenta contains villi on the embryo’s side of the tissue. On the mother’s side are blood spaces, which surround the villi. This provides a large surface area for glucose and oxygen to pass from the mother to the embryo. The developing embryo will also generate waste substances which can be removed by transferring them into the mother’s blood through the placenta.The placenta is attached to the fetus by the umbilical cord and expelled after birth.

Answered by | 29 Jan, 2010, 07:53: AM

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