What is Diaphragm?
[[Image:gray390.png|thumb|200px]] The '''diaphragm''' is a [[muscle]] that is at the bottom of the [[rib]]cage of [[mammal]]s. ==paola == webreati in, the diapragm puls dow s that the sitzad of the [[lung]]s increases, allowing air to enter the lungs. When breathing out, the diaphragm rests and goes up making a [[dome]] shape, decreasing the size of the lungs and pushing [[air]] out. This increases the [[surface area]] of the air so that there is more [[oxygen]] that the lungs can hold. ==Other websites== *[http://www.scienceaid.co.uk/biology/humans/respiratorysystem.html Science Aid: Lungs] {{Webarchive|url=https://web.archive.org/web/20090725134130/http://www.scienceaid.co.uk/biology/humans/respiratorysystem.html |date=2009-07-25 }} {{-}} == Related pages == * [[Respiratory system]] == References == {{Biology-stub}} [[Category:Anatomy of the respiratory system]] [[Category:Muscles]]