Respiratory System Function of the Lungs Supplies oxygen to the blood by inhaling. This oxygen is then carried to all the cells of the body. Removes carbon dioxide (a waste gas) from the cells and release it outside the body. This is done when you exhale. Facts about the lungs In the cells the oxygen being delivered combines with nutrients to provide energy that the cells can use. The carbon dioxide that you breathe out is absorbed by the plants and converted back into oxygen. What makes up the respiratory system? Trachea: Windpipe that directs air to the lungs Bronchi: passages through which air enters the lungs Alveoli: microscopic air sacs in the lungs which allow the exchange of O2 and Co2 Diaphragm: muscle that contracts and relaxes to allow the lungs to breathe. Common Problems Bronchitis: swelling of the bronchi caused by a virus or bacteria causing coughing, fever, and chest tightness. Asthma: an inflammatory disease that causes the bronchi to become blocked or narrowed. Pneumonia: is a lung infection caused by viruses or bacteria. Common Cancers Emphysema: a disease in which the alveoli are damaged or destroyed. Lung Cancer: a disease in which tissues of the lung are destroyed by the growth of a tumor. Caring for your lungs Stay Active: regular activity strengthens your lungs and helps keep parts of the respiratory clear. It also strengthens your diaphragm. Avoid smoking and secondhand smoke: All types of tobacco increase your risk of respiratory diseases. Healthy Vs. sick