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.Which change in fetal physiologic activity is not part of this process?

A) Fetal lung fluid is cleared from the air passages during labor and vaginal birth.
B) Fetal partial pressure of oxygen (PO₂) decreases.
C) Fetal partial pressure of carbon dioxide in arterial blood (PaCO₂) increases.
D) Fetal respiratory movements increase during labor.

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