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  1. Oct 2020
  2. www.ck12.org www.ck12.org
    18.2: Introduction to the Digestive System
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    1. moh123456 13 Oct 2020
      somatic nervous system

      it is the nervous system where the brain send electrochemical signals to the motor nerves to prefom contractions

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    ck12.org/book/ck-12-human-biology/