Changes

===Air Modification===

===Air Modification===

Upon entry to the respiratory system, air is modified to protect the system:

Upon entry to the respiratory system, air is modified to protect the system: Particles are trapped and removed by the mucociliary escalator; Air is humidified by the evaporation from mucus and secretions from the epithelium and air is warmed due to the close proximity to the capillary network underlying the respiratory epithelium.

*Particles trapped and removed by the Mucociliary Escalator.

*Air is humidified by the evaporation from mucus and secretions from the epithelium.

*Air ia warmed due to the close proximity to the capillary network underlying the respiratory epithelium.

===Mucociliary escalator===

===Mucociliary escalator===