A student reviewing the anatomy and physiology of the fetal circulatory system learns that the highest concentration of oxygen in fetal blood is measured at what level?
A.
10-20 mm Hg
B.
20-25 mm Hg
C.
30-35 mm Hg
D.
40-50 mm Hg
ANS: C
The highest concentration of oxygen (PO2) in fetal circulation is found in the blood returning from the placenta via the umbilical vein and is measured at 30-35 mm Hg.
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