Principles of Anatomy and Physiology 14e with Atlas of the Skeleton Set (14th Edition)

Published by Wiley
ISBN 10: 1-11877-456-6
ISBN 13: 978-1-11877-456-4

Chapter 23 - The Respiratory System - Figure 23.21 - Page 870: 1

Answer

At a PO2 of 40 mm Hg, fetal blood is 80 % saturated with oxygen.

Work Step by Step

At the same partial pressure (40 mm Hg) maternal blood is only 75% saturated. Clearly, fetal hemoglobin has greater affinity for oxygen than does adult (maternal) hemoglobin.
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