toofyeileyah53 toofyeileyah53

27-01-2019
Biology

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Identify how the physical barriers of the immune system protect the body against pathogens

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tisherself tisherself

28-01-2019

the first physical barrier of the immune system is the skin. most pathogens are unable to pass through, unless thru a scratch or lesion.

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nicolacorio02 nicolacorio02

30-01-2019

skin contains tightly packed cells

skin is tough, flexible, and waterproof

you cough when a pathogen enters your mouth

you sneeze when a pathogen enters your nose

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