RT Book, Section A1 Panus, Peter C. A1 Jobst, Erin E. A1 Masters, Susan B. A1 Katzung, Bertram A1 Tinsley, Suzanne L. A1 Trevor, Anthony J. SR Print(0) ID 6095983 T1 Chapter 35. Drugs Affecting the Respiratory System T2 Pharmacology for the Physical Therapist YR 2009 FD 2009 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-146043-9 LK accessphysiotherapy.mhmedical.com/content.aspx?aid=6095983 RD 2024/10/07 AB The respiratory tract may be divided into upper and lower portions. The upper portion consists of the nose, sinuses, oropharynx, and larynx. The lower portion comprises the trachea and lungs with their associated airways. Disorders and drug therapy of the upper respiratory system differ from those of the lower respiratory tract.