What changes occur in the mother to help the developing embryo? What is a'placenta?

The changes that occur in the mother to help the developing embryo are:
The lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with the help of a special tissue called placenta. This is disc shaped tissue which is embedded in the uterine wall. Placenta contains villi on the embryo’s side of the tissue and blood spaces on mother’s side surrounding the villi. This provides a large surface area for food and oxygen to pass from mother to the embryo and waste products from embryo to mother.
The development of the child in the uterus takes place for about nine months after which the child is bom as a result of rhythmic contractions of the muscles of the uterus. Various hormonal changes also occur during the presence of the embryo inside the mother’s body.


Placenta