Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 38 - Self-Quiz - Page 685: 6

Answer

d.

Work Step by Step

During normal respiration, the inhalation phase is the active stage because it always happens because of contractions; the exhalation portion of the respiratory cycle is passive because the muscles involved in respiration relax.
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