CBSE Class 10 Science 2017 · Paper 31/2/2 · Question 15
What is placenta ? Describe its two major functions.
Answer
The placenta connects the embryo to the mother; it passes food and oxygen to the embryo and removes its wastes.
Placenta: a special disc-shaped tissue embedded in the wall of the uterus that connects the developing embryo to the mother. It has villi on the embryo's side, surrounded by blood spaces on the mother's side, and the embryo is joined to it by the umbilical cord.
Two major functions:
(i) Supplying food and oxygen: glucose and oxygen pass from the mother's blood into the embryo's blood across the large surface provided by the villi, giving the embryo its nutrition.
(ii) Removing wastes: waste substances produced by the embryo, such as carbon dioxide, pass from the embryo's blood into the mother's blood and are removed by her body.
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