RT Book, Section A1 Levitzky, Michael G. A2 Levitzky, Michael A2 McDonough, Kathleen A2 Kaye, Alan David A2 Hall, Stanley SR Print(0) ID 1175534848 T1 Mechanics of Breathing T2 Clinical Physiology in Anesthetic Practice YR 2021 FD 2021 PB McGraw Hill PP New York, NY SN 9781259641954 LK accessanesthesiology.mhmedical.com/content.aspx?aid=1175534848 RD 2024/04/24 AB Air, like other fluids, moves from a region of higher pressure to one of lower pressure. Therefore, for air to be moved into or out of the lungs, a pressure difference between the atmosphere and the alveoli must be established. If there is no pressure gradient, no airflow occurs.