Breathing

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  • BREATHING
    • INSPIRATION
      • 2)External intercostal muscles contract
        • to raise ribs
      • 1)Diaphragm contract to become flatter
        • Pushes digestive organs down
      • 3)Volume of thorax increases
      • 4) Pressure in thorax decreases to below atmospheric pressure
      • 5)Air moves in to lungs
    • EXPIRATION
      • 1)Diaphragm relaxes
        • is pushed up by displaces digestive organs
      • 2) External intercostal muscles relax
        • ribs fall
      • 3) volume of thorax decreases
      • 4) Pressure in thorax increases to above atmospheric pressure
      • 5) air move out of lungs

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