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Human Hair Natural Formation (Curly or Straight).
How is it that some of us have straight hair and others have curly or wavy
hair? The answer being the erector pilli muscle is attached to the side of
the epithelial sheath. When the erector pilli muscle contracts it pulls the
epithelial sheath with the new hair inside into a (“C Shape”). Depending
on how many times a month the erector pilli muscle contracts and
relaxes, determines the amount of curl in your hair. (Fig17.)
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