Changes

An artery, and a vein enter each lung medially at the hilum... A small network of blood capillaries in the walls of the alveoli affords surfaces for the actual exchange of gases. [http://www.answers.com/topic/lung]  

An artery, and a vein enter each lung medially at the hilum... A small network of blood capillaries in the walls of the alveoli affords surfaces for the actual exchange of gases. [http://www.answers.com/topic/lung]  

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== External links ==

== External links ==

*[http://kidshealth.org/kid/htbw/lungs.html Your Lungs & Respiratory System] For Kids.

*[http://kidshealth.org/kid/htbw/lungs.html Your Lungs & Respiratory System] For Kids.

*[http://www.smm.org/heart/lungs/top.html About Your Lungs]

*[http://www.smm.org/heart/lungs/top.html About Your Lungs] Science Museum of Minnesota.

[[category:anatomy]]

[[category:anatomy]]