Works Cited

Coolidge-Stolz, Elizabeth, Michael J. Padilla, Martha Cyr, and Ioannis Miaoulis.

Human Biology and Health. Needham, MA: Pearson Prentice Hall, 2005. Print.

Padilla, Michael J., Martha Cyr, and Ioannis Miaoulis. Prentice Hall Science Explorer:

Human Biology and Health. Needham, MA: Pearson Prentice Hall, 2005. Print.



SITIOS WEB DONDE SAQUE LAS FOTOS.

http://search.creativecommons.org/?q=respyratori%20system#

http://www.flickr.com/photos/mattdanko/3230072122/

http://www.flickr.com/photos/bibliodyssey/2844033207/sizes/o/in/photostream/

http://www.flickr.com/photos/westm/3743407311/sizes/l/in/photostream/