Brief Look at Respiration

Before learning about respiratory diseases and the medications used to treat them, let's take a few moments to briefly review the anatomy and physiology of the respiratory tract. This review will help you better understand the disease and treatment.

Copyright © 2006 by The McGraw-Hill Companies, Inc. Click here for terms of use.

The respiratory tract is divided into the upper and the lower tracts. The upper respiratory tract contains the nares, nasal cavity, pharynx, and larynx and the lower tract consists of the trachea, bronchi, bronchioles, alveoli, and alveolar-capillary membrane.

During respiration, air is inhaled and makes its way through the upper respiratory tract and travels to the alveoli capillary membrane in the lower respiratory tract, which is the site of gas exchange. Oxygen from the air attaches to the hemoglobin of the blood while carbon dioxide leaves the blood and is expelled through the lower and upper respiratory tracts during expiration.

0 0

Post a comment