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Primary Defences

Description

Biology (Immunity) Mind Map on Primary Defences, created by gschristie95 on 05/02/2013.
gschristie95
Mind Map by gschristie95, updated more than 1 year ago
gschristie95
Created by gschristie95 over 9 years ago
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Resource summary

Primary Defences
  1. Examples
    1. Skin
      1. a physical barrier
        1. also a chemical barrier
          1. sebaceous glands produce oily sebum which waterproofs and has an antibacterial chemical with a low pH to inhibit microbial growth
          2. can be penetrated by cuts, insect bites and natural boday openings
          3. Mucus membranes
            1. these protect body openings eg. mouth, ears, nostrils and genitals
              1. most of them secrete mucus to trap pathogens
                1. the mucus usually contains an antibacterial chemical to slow the muliplication of the bug
              2. Tears
                1. Blood clotting
                2. their function is to stop the entry of parasites and pathogens
                  1. block a huge number of microbes daily
                    1. if the primary defences are penetrated, the first response of the body is phagocytosis
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