28Human Reproduction Sex HormonesMedium1 mark
Which row shows the correct direction and site for the net exchange of gases between the mother’s blood and the fetus’s blood?
| carbon dioxide | oxygen | site of exchange | |
|---|---|---|---|
| A | from fetus to mother | from mother to fetus | placenta |
| B | from fetus to mother | from mother to fetus | umbilical cord |
| C | from mother to fetus | from fetus to mother | placenta |
| D | from mother to fetus | from fetus to mother | umbilical cord |