
Pathology of Chronic Obstructive Pulmonary Disease (COPD)
In a healthy person, oxygen rich air travels through the lungs and enters the bloodstream, providing oxygen to the body. Air enters the body through the nose and mouth then moves into the trachea and bronchial tree, eventually reaching the alveoli. Alveoli are tiny air sacs that resemble balloons; they inflate when you breath in and deflate partly when you breath out.