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.
ANS: C
Uterine contractions during labor tend to decrease circulation through the spiral electrodes and subsequent perfusion through the intervillous space. 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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