Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 10 - Assess - Page 215: 7

Answer

7. b. Atmospheric pressure is greater than intrapulmonary pressure

Work Step by Step

Atmospheric pressure (Patm) at sea level is 760 mm Hg. During inspiration the thoracic cavity increases; this causes the intrapulmonary pressure (Palv.) to fall below the level of atmospheric pressure. This so-called negative pressure causes air to flow into the lungs.
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