* Placenta: This is a temporary organ that develops during pregnancy. It's attached to the uterine wall and connected to the baby via the umbilical cord.

* Umbilical cord: This cord carries blood vessels that transport nutrients and oxygen from the mother's blood to the embryo. It also carries waste products from the embryo back to the mother's system for disposal.

Here's how it works:

1. Mother's blood: The mother's blood carries nutrients and oxygen.

2. Placenta: The placenta filters the mother's blood, passing essential nutrients and oxygen to the embryo's blood.

3. Umbilical cord: These nutrients and oxygen travel through the umbilical cord to the embryo.

4. Embryo: The embryo uses these nutrients to grow and develop.

5. Waste products: The embryo's waste products travel back through the umbilical cord to the placenta and then to the mother's bloodstream for disposal.

Important note: This process starts early in pregnancy and continues until birth. The placenta is essential for the embryo's survival and development.