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Q:

Which of the following consists of the exchange part of the respiratory system?

  • 1
    From external nostrils up to the alveoli
  • 2
    From external nostrils to terminal bronchioles
  • 3
    From trachea to terminal bronchioles
  • 4
    Alveoli and their ducts
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Answer : 4. "Alveoli and their ducts "

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