As the uterus contracts during labor, the maternal-fetal exchange of oxygen and waste products:
a. Continues except when placental functions are reduced.
b. Increases as blood pressure decreases.
c. Diminishes as the spiral arteries are compressed.
d. Is not significantly affected.
C
During labor contractions, the maternal blood supply to the placenta gradually stops as the spiral arteries supplying the intervillous space are compressed by the contracting uterine muscle.
The maternal blood supply to the placenta gradually stops with contractions.
The exchange of oxygen and waste products decreases.
The exchange of oxygen and waste products is affected by contractions.
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