Natural
(Non-Specific) Immunity - 2
Four components of the system
1.Two anatomic
(physical) barriers:
˜skin - 5
factors
˜mucous
membranes - 3 factors
&mechanical
barrier
&continous
renewal of epithelial cells
&sebaceous
glands secrete sebum which contains lactic acid and fatty acids
&pH (3 -
5) of skin surface
&normal
bacterial flora can metabolize sebum
&traps
foreign microorganisms
&normal
bacterial flora compete for attachment sites and nutrients
&cilia
propel microorganisms from body
