Chronic Obstructive Pulmonary Disease.

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Every time you take a breath, air travels down your windpipe (trachea), into the breathing (bronchial) tubes. These breathing tubes branch like a tree into smaller and smaller airways (bronchioles) which finally end into the air sacs (alveoli) in the lungs. There are over 300 million of these air sacs which are composed of a thin membrane and it is here that the oxygen you breathe in is transferred into the blood stream.

Most of the air passage is lined by very small protective hairs calledcilia which help to keep the dust and other pollutants from entering the lungs. Any factor (smoke, dust) that irritates the air passages and damages the cilia may cause obstruction in airflow to the lungs causing shortness of breath, tiredness and coughing resulting in a condition called as COPD (Chronic Obstructive Pulmonary Disease).