Human Biology

(Sean Pound) #1

http://www.ck12.org Chapter 1. Human Biology


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  1. How do external barriers help our immune system? What problems would we have if we did not have these
    barriers?

  2. Where is mucus used as a barrier?

  3. How do some bacteria aid our immune system?


Review



  1. How does your skin protect you from pathogens?

  2. How do helpful bacteria defend your body?

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