Mechanics of expiration

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  • So muscles of ribs are relaxing.
  • Mechanics of expiration

    1. 1. Mechanics of expiration During expiration muscles of ribs arerelaxed and ribs move downward and inward.
    2. 2. You know what relaxed mean
    3. 3. Chest cavity becoming small in size• When ribs are relaxed, space of chest gets less.
    4. 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. 5. Check the width of chest cavity
    6. 6. • This reduction in space of chest cavity exert pressure on lungs.
    7. 7. Air moves out of lung• When the lungs are pressed ,the air moves out of lungs and this process is called expiration.

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