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: 7

Answer

a.

Work Step by Step

The thoracic cavity expands during inhalation, causing the lungs also to expand. The diaphragm contracts and helps the thoracic cavity to expand. This process causes the air pressure in the alveoli to become lower than that of atmospheric pressure, resulting in a gradient that allows air to rush into the airways.
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