Certain Changes Stimulate Chemoreceptors in the Aorta and Carotid Bodies

Certain changes stimulate chemoreceptors in the aorta and carotid bodies to prepare the fetus for initiating respirations immediately after birth.These changes occur naturally during labor and include all except:

A) Fetal lung fluid is cleared from the air passages during labor and vaginal birth
B) Fetal oxygen pressure decreases (PO2)
C) Fetal arterial carbon dioxide increases (PCO2)
D) Fetal respiratory movements increase during labor

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