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Biology LibreTexts

Part 1: Mechanism of Breathing

  • Page ID
    20785
  • Materials:

    • Balloon-and-bell jar

    Mechanism of breathing.PNG

    Procedure:

    1. Pull down the rubber sheet. What happens to the balloons?
      • This represents the downward movement of the human _________________, which causes the chest cavity to become ______________________________ (larger/smaller). This, in turn, causes the human ______________________________ to expand and fill with air.
    2. Release the rubber sheet. What happens to the balloons?
      • This represents relaxed ___________________ (inhaling/exhaling), when the chest cavity becomes smaller and the lungs deflate. Note that this is a passive process.
    3. What organs do the balloons represent?