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Define lung volume and air pressure. Then describe how changes in lung volume and air pressure...

Define lung volume and air pressure. Then describe how changes in lung volume and air pressure within the lungs allow inspiration and expiration to occur.

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Lung volume - it is defined as the total volume of air occupy in lung during respiration. It is also known as lung capacity. It is 6 litres in adult. Air pressure - it is defined as the force exerted on a surface by particle of air.

Lung volume is divided into four volumes are following 1) Tidal volume - The total volume of air during normal inspiration and expiration. It is generally about 6liters in human.

2)Residual volume (RV) - the volume of air remaining in lung after normal expiration.

3) Expiratory reserve volume - The maximum volume of air exhale /expiration after normal expiration.

4) Inspiratory reserve volume - The maximum volume of air that can inhale after normal inspiration.

During all lung volume change in air pressure also .

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