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Mechanics  of expiration
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Mechanics of expiration

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  • So muscles of ribs are relaxing.
  • Transcript

    • 1. Mechanics of expiration During expiration muscles of ribs arerelaxed and ribs move downward and inward.
    • 2. You know what relaxed mean
    • 3. Chest cavity becoming small in size• When ribs are relaxed, space of chest gets less.
    • 4. What happens to diaphragm• Muscles of diaphragm also relax and they become more domelike in shape, so chest cavity is also reduced from floor.
    • 5. Check the width of chest cavity
    • 6. • This reduction in space of chest cavity exert pressure on lungs.
    • 7. Air moves out of lung• When the lungs are pressed ,the air moves out of lungs and this process is called expiration.