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Mechanics of expiration During expiration muscles of ribs are relaxed and ribs move downward and inward.

Mechanics of expiration

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Page 1: Mechanics  of expiration

Mechanics of expiration

During expiration muscles of ribs are relaxed and ribs move downward and

inward.

Page 2: Mechanics  of expiration

You know what relaxed mean

Page 3: Mechanics  of expiration
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Chest cavity becoming small in size

• When ribs are relaxed, space of chest gets less.

Page 5: Mechanics  of expiration

What happens to diaphragm

• Muscles of diaphragm also relax and they become more domelike in shape, so chest cavity is also reduced from floor.

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Check the width of chest cavity

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• This reduction in space of chest cavity exert pressure on lungs.

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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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