Howstuffworks "Coughing"

Coughing is the mechanism for clearing the breathing passages of unwanted irritants. The estimated speed of air released during a cough is around 100 mph. This animation illustrates what happens during the coughing reflex.

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"Coughing." 17 February 2005. HowStuffWorks.com. <http://health.howstuffworks.com/adam-200021.htm> 09 May 2008.

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