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![](https://webarchive.library.unt.edu/eot2008/20090831020502im_/http://www.ncbi.nlm.nih.gov/books/bookres.fcgi/gnd/lung.jpg) The respiratory system plays a vital role in delivering oxygen to the body fuel for
all the body's functions. It also removes carbon dioxide waste, eliminates toxic waste,
regulates temperature, and stabilizes blood acid-alkaline balance (pH). The lungs are the largest part of the respiratory system and have both "respiratory"
and "non-respiratory" functions. The respiratory function involves gas exchange the
transfer of oxygen from the air into the blood and the removal of carbon dioxide from
the blood. Non-respiratory lung functions are mechanical, biochemical, and physiological.
The lungs provide a defense against bacterial, viral and other infectious agents; remove
various metabolic waste products; control the flow of water, ions, and large proteins
across its cellular structures; and manufacture a variety of essential hormones and
chemical agents that have important biological roles. Respiratory diseases can arise from a number of causes, including inhalation of
toxic agents, accidents, and harmful lifestyles, such as smoking. Infections,
genetic factors, and anything else that affects lung development, either directly or
indirectly, can cause respiratory symptoms.![top link](https://webarchive.library.unt.edu/eot2008/20090831020502im_/http://www.ncbi.nlm.nih.gov/books/bookres.fcgi/system_default/top.gif)
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