1.      What is placenta? Mention its role during pregnancy?

Placenta 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, which surround the villi. This provides a large surface area for glucose and

oxygen to pass from the mother to the embryo. The embryo gets nutrition from the mother’s blood with the help of placenta. The developing embryo will also generate waste substances which can be removed by transferring them into the mother’s blood through the placenta.