Breathing for most of us is something we do without being aware of it. We pay no attention to this continuous activity as we work, play, or sleep. Our lungsare responsible for this essential natural function that gets oxygen into thebloodstream so that it can be delivered to the cells of our body.
During a normal day, we breathe nearly 25,000 times. The more than 10,000liters of air we inhale is mostly oxygen and nitrogen. In addition, there aresmall amounts of other gases, floating bacteria, and viruses. It also containsthe products of tobacco smoke, automobile exhaust, and other pollutants from theatmosphere in varying amounts.
Air pollutants can affect our lungs in many ways. they may simply causeirritation and discomfort. But sometimes inhaled materials can cause illness ordeath. The lungs have a series of built-in mechanical and biological barriersthat keep harmful materials from entering the body. In addition, specificdefense mechanisms can inactivate some disease-causing materials.
For much more information about the lung, and diseases of the lung, please visit the following websites: