Emphysema damages the walls between the alveoli causing irregular pockets in the inner walls.
Explanation:
Emphysema is a condition that damages the walls of the alveoli of the lungs. Normally as a person breathes the alveoli stretches and draws oxygen and transports it to blood and when he exhales the alveoli shrinks and forcing carbon dioxide out of his body.
When Emphysema develops the alveoli and the lung tissues get destroyed, the bronchial tubes collapses and an obstruction is caused that traps the air inside the lings. This reduces the oxygen supply in the blood stream. Smoking, air pollution and other respiratory diseases are the major reasons for emphysema.