Final answer:
During labor, the maternal-fetal exchange of oxygen and waste products diminishes as the spiral arteries are compressed. However, as long as the placental functions are not significantly reduced, the exchange continues.
Step-by-step explanation:
The maternal-fetal exchange of oxygen and waste products diminishes as the spiral arteries are compressed during labor. The placenta is responsible for the exchange of oxygen and nutrients between the maternal and fetal circulatory systems.
As the uterus contracts during labor, the spiral arteries are compressed, reducing the blood flow to the placenta. This reduction in blood flow leads to a decrease in the exchange of oxygen and waste products between the maternal and fetal circulations. However, it's important to note that the exchange of oxygen and waste products between the maternal and fetal circulations continues as long as the placental functions are not significantly reduced.