Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1259188132
ISBN 13: 978-1-25918-813-8

Chapter 48 - The Respiratory System - Figure 48.15 - Data Analysis - Page 1015: 1

Answer

You could measure how much oxygen was in the arteries and subtract the amount in the veins, since any difference must be the oxygen which went to the tissues.

Work Step by Step

It's a matter of simple accounting: input and output. The difference is what is expended by tissues.
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