Although the embryo depends on the mother's blood for its nutrition and supply of oxygen, its circulatory system is never directly connected with the maternal blood vessels.
a. What will be the effect on the embryo if its circulatory system is directly connected with the maternal blood vessels?
b. State two functions of the placenta.

Explanation

a. Antigen - Antibody reaction will take place
b. i. Acts as ultra filier, ii. Elimination of nitrogen wastes