Lung and its Functions
Lungs are the primary organs of respiration in humans and many other animals. Lungs are sack of tissue located just below the rib cage and above the diaphragm. The lungs are a pair of organs that are responsible for the exchange of oxygen and carbon dioxide between the air and blood. The exchange of the air between the lungs and blood are through the arterial and venous system. Arteries and veins both carry and move blood throughout the body, but the process for each is very different. The lungs are a pair of cone-shaped, spongy, pinkish-grey tissue and air-filled organs. The trachea conducts inhaled air into the lungs through its tubular branches called bronchi. In the lungs, the main stem bronchi divide into smaller bronchi and then into even smaller tubes called bronchioles. Bronchioles end in cluster of tiny air sacs called alveoli. Breathing becomes more challenging in chronic obstructive lung disease due to excess mucus and also degeneration of the lungs. The bronchioles become inflamed and narrower in COPD patient.