Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 48 - The Respiratory System - Figure 48.6 - Data Analysis: 1

Answer

Greatest diffusion should occur where the concentration gradient is greatest: in the countercurrent system at the ends of the system, though the concentration difference and the absorption rate are nearly constant along its length; in the concurrent system, at its start when the difference is 100%.

Work Step by Step

To understand this, see that the gradient in oxygen concentration is most critical to drive diffusion. Then look at Fig. 48.6 to find where this is for each kind of system.
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