Lung Disease and COPD
COPD, or chronic obstructive pulmonary disease, is a condition in which the airways in the lungs become broken down and narrowed. Sometimes the air sacs are also damaged. To understand why COPD develops, it is important to understand how the lungs work. Normally, air that we breathe passes from the nose and mouth through the airways to the tiny air sacs of the lung, called alveoli. In the air sacs, oxygen that we breathe passes through the walls of air sacs into the bloodstream. Carbon dioxide passes in the reverse direction, out of the bloodstream, back into the alveoli, and is then eliminated by breathing out. Carbon dioxide is a waste product of the body's metabolism, and must be regularly removed.









