When a blood test was performed on Cindy's fetus,the doctors found some of Cindy's red blood cells in the fetus's circulatory system.We know that this:
A)is normal,since the mother is the source of red blood cells for the fetus.
B)is normal,since the mother's red blood cells are a source of oxygen for the fetus.
C)indicates a problem with the placenta,which should block the mother's red blood cells.
D)indicates a problem with the amnion,which should eliminate the mother's red blood cells.

Question

Quizplus · Accepted Answer

Presence of Cindy's red blood cells in her fetus's circulatory system indicates a problem with the placenta because large molecules like red blood cells are normally blocked by the placental wall.

When a Blood Test Was Performed on Cindy's Fetus,the Doctors