Figure 22. 16 Respiratory volume and Capacities.

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Tidal Volume ( TV)

Normal breathing volume approximately 500 ml.


Inspiratory reserve volume ( IRV)

After a normal inhalation if you force in air ( suck in air) that is the inspiratory reserve volume which is about 3100 ml.


Expiratory reserve volume ( ERV)

is the air you blow out of the lungs after a deep breath ( Inspiratory volume) which is about 1200 ml.


Residual Volume ( RV)

Is air remaining in the lungs, its about 1200 ml. helps keep the alveoli open and prevents lung collapse.


What is capacity?

is combining two or more volumes.


Inspiratory capacity ( IC)

is the tidal volume ( TV) plus inspiratory reserve volume ( IRV) which equals 3600 ml. Total amount of air that can be inspired after a tidal expiration.


Functional residual capacity ( FRC)

Amount of air remaining in lungs after a tidal expiration. Expiratory reserve volume ( ERV) plus residual volume (RV) which equals 2400 ml.


Vital Capacity ( VC)

The total amount of exchangeable air, it's what you have control over. Tidal volume plus Inspiratory reserve volume plus Expiratory reserve volume. TV t IRV t ERV which equals 4800 ml.


Total lung capacity ( TLC)

The sum of all lung volumes, normally about 6000 ml.


Alveolar ventilation rate ( AVR)

Measures the flow of fresh gases into or out of the alveoli during a particular time.


Forced vital capacity ( FVC)

Air forcibly expelled after taking a deep breath.


Forced expiratory volume ( FEV)

Amount of gas expelled during specific time intervals of the forced vital capacity ( FVC).

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