Changes

'''''Mucus Membranes'''''

'''''Mucus Membranes'''''

* Thin epithelial surfaces are necessary for the normal physiological functions of the bodies mucus membranes (ie absorption and gas exchange).They are therefore more susceptible to infection

* Thin epithelial surfaces are necessary for the normal physiological functions of the body's mucus membranes (ie absorption and gas exchange).They are therefore more susceptible to infection

**  The body uses alternative protective mechanisms in these areas:

**  The body uses alternative protective mechanisms in these areas:

***  The '''mucociliary escalator''' of the respiratory tract (assisted by coughing and sneezing)

***  The '''mucociliary escalator''' of the respiratory tract (assisted by coughing and sneezing)