Question

what does the mother's blood take away from the baby and into placenta

Answer 1

The placenta is soft and has capillaries filled with the embryo’s blood. The wall of the uterus has large spaces filled with the mother’s blood. The wall of the placenta is very thin which brings the mother’s blood supply alongside the foetus to allow the exchange of food and oxygen to the foetus, and for the foetal waste and carbon dioxide to transfer to the mother. The blood of the mother and foetus do not mix, but substances are exchanged through the placenta by diffusion. The developing foetus does not breathe within the uterus, but instead it uses the placenta to get what it needs to develop and survive.