The embryo gets nutrition from the mother’s blood with the help of a special tissue called placenta. This is a disc which is embedded in the uterine wall. It contains villi on the embryo’s side of the tissue. On the mother’s side are blood spaces. This provides a large surface area for diffusion of glucose, oxygen and other nutrients from the mother to the embryo.
What is Placenta?
The placenta is defined as an organ that develops during pregnancy in mammals. The placenta provides oxygen and nutrients to the growing fetus in the uterus of the mother. Placenta in mammals is divided into two types, which are
- Yolk sac placenta
- Chorioallantoic placenta