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MECHANICAL BARRIERS:
Epiglottis

Prevents aspiration of food into the lungs.

Also prevents entry of microorganisms into the
lungs.
Microbiology: A Clinical Approach
Approach, ©
byGarland
Tony Srelkauskas
Science © Garland Science
ISBN: 978-0-8153-6514-3
CHEMICAL BARRIERS


Many chemical substances are secreted by the
body including:

Sebum

Perspiration

Gastric juice

Urine

Transferrin
Barrier defense is not their primary function.
Microbiology: A Clinical Approach
Approach, ©
byGarland
Tony Srelkauskas
Science © Garland Science
ISBN: 978-0-8153-6514-3
CHEMICAL BARRIERS:
Sebum

Produced by sebaceous glands

Contains unsaturated fatty acids and organic
acids


Forms a protective layer on the skin.
Inhibit bacterial growth by lowering pH.
Microbiology: A Clinical Approach
Approach, ©
byGarland
Tony Srelkauskas
Science © Garland Science
ISBN: 978-0-8153-6514-3
Microbiology: A Clinical Approach [9780815365143] © Garland Science