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PREVENTING INGRESS (MUCOCILIARY ESCALATOR (respiratory tract lined with…
PREVENTING INGRESS
SKIN
tough outer layer - produces
keratin
mechanical barrier
Defences
that
prevent
ingress of disease
MUCOCILIARY ESCALATOR
respiratory tract lined with mucus & cilia
mucus traps microbes
any particles that are trapped in lungs are swept to
epiglottis
where they are swallowed
cilia removes mucus from lungs
GINGIVAL CREVICULAR FLUID
inflammatory exudate (fluid) from gingival margin/crevice
WBC's
Antibacterial solution
- contains immunological defence mechanisms
FATTY ACIDS & SALTS
glands in skin secrete fatty acids & lysosomes that kill bacteria
BLOOD
entry of infections through wounds
flushing action
blood clotting
SALIVA
lavage effect
antibacterial agents
BLOOD BRAIN BARRIER
specialised filter
keeps out toxins, proteins & other micro-organisms
let's in glucose
surrounds brain & spinal cord