Respiratory System

 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.

 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.

 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.

 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.

 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.