12. References Brain: Brain, model of; in skull. Paul Fuqua. (2004). Retrieved February 18, 2010, from Discovery Education: http://streaming.discoveryeducation.com/ h5-B987-21AED520EE4B&blnFromSearch=1&productcode=US Plasma. Paul Fuqua. (2004). Retrieved February 18, 2010, from Discovery Education: http:// streaming.discoveryeducation.com / Intestine, small. Paul Fuqua. (2004). Retrieved February 18, 2010, from Discovery Education: http:// streaming.discoveryeducation.com / Vein, valves (2). Paul Fuqua. (2004). Retrieved February 18, 2010, from Discovery Education: http:// streaming.discoveryeducation.com / Nerve with sheath highlighted. Paul Fuqua. (2004). Retrieved February 18, 2010, from Discovery Education: http:// streaming.discoveryeducation.com / Nerve with synaptic cleft highlighted. Paul Fuqua. (2004). Retrieved February 18, 2010, from Discovery Education: http:// streaming.discoveryeducation.com / Lungs; oxygen entering and carbon dioxide leaving. Paul Fuqua. (2004). Retrieved February 18, 2010, from Discovery Education: http:// streaming.discoveryeducation.com / Lung, model of. Paul Fuqua. (2004). Retrieved February 18, 2010, from Discovery Education: http:// streaming.discoveryeducation.com / Kidney. Paul Fuqua. (2003). Retrieved February 18, 2010, from Discovery Education: http:// streaming.discoveryeducation.com /