respiratory volumes and capacities

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9 Terms

1
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<p>tidal volume (TV)—</p>

tidal volume (TV)—

  • amount of air moved into and out of lung with each breath

  • averages 500ml

2
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<p><strong>Inspiratory</strong> <strong>reserve</strong> <strong>volume</strong> (<strong>IRV</strong>): </p><p></p>

Inspiratory reserve volume (IRV):

amount of air that can be inspired forcibly beyond the tidal volume (2100–3200 ml)

3
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<p><strong>Expiratory</strong> <strong>reserve</strong> <strong>volume</strong> (<strong>ERV</strong>): </p><p></p>

Expiratory reserve volume (ERV):

amount of air that can be forcibly expelled from lungs (1000–1200 ml) 

4
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<p><strong>Residual</strong> <strong>volume</strong> (<strong>RV</strong>):</p><p></p>

Residual volume (RV):

amount of air that always remains in lungs

-needed to keep alveoli open

5
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<p>respiratory capacities - </p>

respiratory capacities -

combinations of 2 or more respiratory volumes

6
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<ul><li><p><strong>Inspiratory</strong> <strong>capacity</strong> (<strong>IC</strong>): </p></li></ul><p></p>

  • Inspiratory capacity (IC):

  • sum of TV + IRV

7
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<ul><li><p><strong>Functional</strong> <strong>residual</strong> <strong>capacity</strong> (<strong>FRC</strong>): </p></li></ul><p></p>

  • Functional residual capacity (FRC):

  • sum of RV + ERV

8
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<ul><li><p><strong>Vital</strong> <strong>capacity</strong> (<strong>VC</strong>): </p></li></ul><p></p>

  • Vital capacity (VC):

  • sum of TV + IRV + ERV

9
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<ul><li><p><strong>Total</strong> <strong>lung</strong> <strong>capacity</strong> (<strong>TLC</strong>): </p></li></ul><p></p>

  • Total lung capacity (TLC):

  • sum of all lung volumes (TV + IRV+ ERV + RV)