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13.48: Barriers to Pathogens

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

biological barrier

biological barrier

A living organism that helps protect the body.
chemical barrier

chemical barrier

A barrier that destroys pathogens on the outer body surface, at body openings, and on inner body linings.
cilium

cilium

(plural, cilia): Short, hairlike projection, similar to flagellum, that allows some cells to move.
immune system

immune system

Body system that consists of skin, mucous, membranes, and other tissues and organs that defends the body from pathogens and cancer.
mechanical barrier

mechanical barrier

Barrier that physically block pathogens from entering the body, such as the skin.
mucous membrane

mucous membrane

Epithelial tissue that lines inner body surfaces and cavities exposed to the external environment; produces mucous.
mucus

mucus

Slimy substance produced by mucous membranes that traps pathogens, particles, and debris.

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Difficulty Level:

At Grade

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Date Created:

Feb 24, 2012

Last Modified:

Jan 30, 2016
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SCI.BIO.941.L.1

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