Emphysema is one of the main causes of COPD. The elasticity of the tissue and airspace walls within the lungs become damaged. decrease causes the patient to inIn normal lungs the alveoli are elastic and able to stretch which increases surface area for efficient gas exchange of carbon dioxide and oxygen. The gas exchange process is very important because it delivers oxygen into the bloodstream via pulmonary capillaries. Also, by carbon dioxide moving through the tissues into the capillaries . When a person breathes in, the alveoli sacs stretch while filling up with air; and when exhaling the sacs empty and recoil back to their original size. When they become damaged due to toxins and pollutants such as cigarettes, they become less elastic
