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Asked by dkaddkad - 4 years ago
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babe2 Level 5
Answered 4 years ago
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Our normal resting breathing moves only a small percentage of the air contained in our lungs. The lungs are highly elastic and can move significantly more air when we take exercise than we normally move at rest.
The volume of air that a human breathes into and out of their lungs while at rest is called the tidal volume. This is a relatively small volume of air (around 500 cm3) and provides enough oxygen for a human’s resting needs.
The maximum amount of air that may be inspired, above tidal inspiration, is called the inspiratory reserve volume. The typical adult value is 2 to 3.2 dm3.
The maximum amount of air that can be breathed out, above tidal expiration is called the expiratory reserve volume. The typical adult value is 0.75 dm3 to 1 dm3.
The vital capacity is the sum of all three of these volumes.
Source www.practicalbiology.org
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