Answer
Oxygen percentage is low in air at high altitudes which forces one to breath rapidly. Since lungs also have a type of muscle, they are fatigued due to excessive speed of breathing.
Work Step by Step
As above
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 33, Circulatory and Respiratory Systems - 33.3 - The Respiratory System - 33.3 Assessment - Page 969: 3b
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