Question

Q. State the structure of placenta and explain its function in embryo development.
What is the relation between it and the menstrual cycle?

Answer 1

Placenta is a structure that establishes firm connection between the foetus and the mother. From the outer surface of the chorion a number of finger like projections known as chorionic villi grow into the tissue of the uterus. These villi penetrate the tissue of the uterine wall of the mother and form placenta.
The fertilized egg attaches to the lining of the uterus. The placenta then develops. Theplacenta transfers nutrition and oxygen to the fetus from mother. If the egg does not become fertilized, the lining of the uterus (endometrium) is shed during menstruation