Question

question 4
2 points
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
○ is normal because the mother is the source of red blood cells for the fetus.
○ is normal because the mother’s red blood cells are a source of oxygen for the fetus.
○ indicates a problem with the placenta, since the blood supplies of the fetus and mother should be separate.
○ indicates a problem with the amnion, which should eliminate the mother’s red blood cells.
clear selection

Explanation:

To solve this, we analyze each option:

1. The fetus produces its own red blood cells, so the first option is wrong.
2. Oxygen is transferred via the placenta (not mother’s RBCs), so the second option is wrong.
3. The placenta should keep maternal and fetal blood supplies separate. Finding maternal RBCs in the fetus’s circulation suggests a placental problem, making this option correct.
4. The amnion is for protection (not eliminating RBCs), so the fourth option is wrong.

Answer:

C. indicates a problem with the placenta, since the blood supplies of the fetus and mother should be separate.