What is the primary role of the placenta in relation to the fetal lungs?

The primary role of the placenta in relation to the fetal lungs is to facilitate oxygen exchange. The placenta serves as the interface between the mother and the fetus, allowing for the transfer of oxygen and nutrients to the fetus while simultaneously removing carbon dioxide and waste products. It plays a crucial role in ensuring that the developing fetus receives the oxygen it needs for growth and development.

While the placenta does support other functions, such as providing nutrients and supporting the production of amniotic fluid, its critical function regarding the fetal lungs is centered on gas exchange. The fetus does not use its lungs for breathing in utero; instead, it relies entirely on the placenta for oxygen, which is delivered through the umbilical cord. This makes option A the best answer for the primary role of the placenta in relation to the fetal lungs.