Answer:
Placenta
is a disc-like structure in the lining of the uterine wall. It contains villi
on the embryo's side of the tissues and blood spaces on the mother's side
surround the villi. The embryo is connected to the placenta by a tube called
the umbilical cord.
Role during pregnancy It is through the placenta that all the
requirements of the developing foetus are met.
The villi provide a large surface area that facilitate
passage of nutrition and oxygen to embryo from mother through blood.
Waste substances produced by embryo are removed through
placenta into mother's blood.
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