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66802
Primary Defences
Description
Biology (Immunity) Mind Map on Primary Defences, created by gschristie95 on 02/05/2013.
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biology
immunity
biology
immunity
Mind Map by
gschristie95
, updated more than 1 year ago
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Created by
gschristie95
almost 11 years ago
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Resource summary
Primary Defences
Examples
Skin
a physical barrier
also a chemical barrier
sebaceous glands produce oily sebum which waterproofs and has an antibacterial chemical with a low pH to inhibit microbial growth
can be penetrated by cuts, insect bites and natural boday openings
Mucus membranes
these protect body openings eg. mouth, ears, nostrils and genitals
most of them secrete mucus to trap pathogens
the mucus usually contains an antibacterial chemical to slow the muliplication of the bug
Tears
Blood clotting
their function is to stop the entry of parasites and pathogens
block a huge number of microbes daily
if the primary defences are penetrated, the first response of the body is phagocytosis
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