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      Question

      What are the small, hair-like structures in the upper

      part of the respiratory tract called?
      A Cilia Correct Answer Incorrect Answer
      B Villi Correct Answer Incorrect Answer
      C Alveoli Correct Answer Incorrect Answer
      D Bronchi Correct Answer Incorrect Answer

      Solution

      Cilia are microscopic hair-like structures lining the respiratory tract, playing a crucial role in protecting the lungs by trapping and expelling foreign particles, including dust and microbes.

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