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The respiratory system

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    What's the main function of the respiratory system?
  •   Study   Slideshow
  • Air flows down the________________into the lungs.
    Trachea
  •  25
  • What do our muscles need to function?
    Our muscles need oxygen to function.
  •  20
  • What does the respiratory system takes in?
    Oxygen
  •  15
  • The respiratory system takes in oxygen and expels.............
    Carbon dioxide
  •  10
  • At the end of the small tubes there are small air sacs called.......................
    Alveoli
  •  5
  • Where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out are called.................
    Alveoli
  •  25
  • The trachea divides into two..........................
    Bronchi
  •  20
  • Trachea is connected to the
    lungs
  •  15
  • There are lots of small air tubes inside the lungs called............
    bronchiole
  •  10
  • The_________is a muscle that contracts when you breathe in to help the lungs expand.
    Diaphragm
  •  5