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The respiratory system is defined as group of organs in the body that are responsible for taking in oxygen and breathing out carbon dioxide. The primary function of the respiratory system is to supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body. The respiratory system does this through breathing. When we breathe, we inhale oxygen and exhale carbon dioxide. This exchange of gases is the respiratory system's means of getting oxygen to the blood. Respiration is achieved through the mouth, nose, trachea, lungs, and diaphragm. One of the common respiratory diseases is Chronic Obstructive Pulmonary Disease (COPD). Chronic Obstructive Pulmonary Disease (COPD) is a disease characterized by airflow limitation that is not fully reversible. COPD may include diseases that cause airflow obstruction. Under these diseases is emphysema. Emphysema is a pathologic term that describes an abnormal distention of the air spaces beyond the terminal bronchioles, with destruction of the walls of the alveoli. As the walls of the alveoli are destroyed, the alveolar surface are in direct contact with the pulmonary capillaries continually decreases, causing an increase in dead space and impaired oxygen diffusion which leads to hypoxemia.

Chronic Obstructive Pulmonary Disease is a growing cause of morbidity and mortality worldwide. The WHO Burden of Disease Project estimated that COPD was the fifth leading cause of death worldwide in 2001 and will be the third leading cause by 2020. The 1998 World Health Organization report state that non-communicable diseases, including COPD is the cause of nearly 40% of all deaths in developing countries and that these areas account s for 67% of all COPD deaths worldwide. In 1987, The Philippines estimated the prevalence of COPD based on spirometric measurements to be 3.7%. In 2007, the prevalence of COPD in the Philippines was reported 13.8% among...
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