The maternity nurse understands that as the uterus contracts during labor, 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
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A The maternal blood supply to the placenta gradually stops with contractions.
B The exchange of oxygen and waste products decreases.
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.
D The exchange of oxygen and waste products is affected by contractions.
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