References

Aurora Health Care(2011) Conditions and diseases-respiratory system. Retrieved June 20th  2011from www.aurorahealthcare.org/yourhealth/healthgate/getcontent.asp

BBC Home Edited Guided Entry, The human respiratory system, Retrieved June 20th 2011from www.bbc.co.uk/dna/h2g2/A27019505

Cool quiz (2011)Why do we yawn?Retrieved June 20th 2011from www.coolquiz.com/trivia/explain/docs/yawn.asp

Gadd, P.(1993) Human and social biology for the tropics 4th edition, MacMillan Publishers, 66, 68, 72

Healthy Way (2008) Coughig it up, Retrieved June 20th 2011 from www.healthywaymagazine.com/issue35/05_html

Hillendale Health, Respiratory system, Retrieved June 20th 2011from https://hes.ucfsd.org/gclaypo/repiratorysys.html

Letusfindout.com (2011)Why do we sneeze?,Retrieved June 20th 2011from www.letusfindout.com/why-do-we-sneeze/

The Merck Manuals Online Medical Library(2010) Retrieved June 20th 2011from www.merckmanuals.com/home/sec04/ch038/ch038d.html

Science Musuem, Ask Glenn, Why do we get hiccups and how do we stop them? Retrieved June 20th 2011from www.sciencemusuem.org.uk/onlinestuff/snot/why_do_we_get_hiccups_and_how_do_we_stop_them_.aspx

Soper, R. & Smith, S. Biology an integrated approach, MacMillan Education, 109, 110, 112

TeachPE (2011) Gaseous exchange in the lungs Retrieved June 20th 2011from www.teachpe.com/anatomy/gas_exchange.php

West, S.(2009) Ambulance technician study, Respiratory system Retrieved June 20th 2011from www.ambulancetechnicianstudy.co.uk/respsystem.html