Not Now. Established in 1989, the Clearwater Volunteer Fire Department serves the Clearwater (Tennessee) community and surrounding area with support. 1,185 people like this and 1,166 people follow this.
Pathologic changes in chronic obstructive pulmonary disease (COPD) occur in the large (central) airways, the small (peripheral) bronchioles, and the lung parenchyma. Most cases of COPD are the result of exposure to noxious stimuli, most often cigarette smoke.
Asthma is a chronic disease that affects the airways of the lungs. During normal breathing, the bands of muscle that surround the airways are relaxed and air moves freely. During an asthma episode or attack, there are three main changes that stop air from moving easily through the airways: The bands of muscle that surround the airways tighten and make the airways narrow.