Key Terms in Spirometer Readings

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12 Terms

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Tidal volume

The volume of air in a normal breath at rest (0.5 dm³)

<p>The volume of air in a normal breath at rest (0.5 dm³)</p>
2
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Vital Capacity

Maximum volume of air that can be inhaled and exhaled

<p>Maximum volume of air that can be inhaled and exhaled</p>
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Inspiratory Reserve Volume

The max volume of air that can be inhaled above the tidal volume of air

<p>The max volume of air that can be inhaled above the tidal volume of air</p>
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Expiratory Reserve Volume

The max volume of air that can be exhaled above the tidal volume of air

<p>The max volume of air that can be exhaled above the tidal volume of air</p>
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Residual Volume

The volume of air that can never be expelled from the lungs.

<p>The volume of air that can never be expelled from the lungs.</p>
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Total Lung Capacity

Vital Capacity + Residual Volume

<p>Vital Capacity + Residual Volume</p>
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Breathing Rate

The number of breaths taken per minute.

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How to calculate breathing rate:

- peak to peak (or trough to trough) is one breath

- Count the number of breaths per minute

- Total air breathed per minute (pulmonary ventilation) is: tidal volume x breathing rate

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Ventilation Rate

Tidal volume x Breathing rate = Pulmonary Ventilation

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Oxygen Uptake

The volume of oxygen taken up by the body/lungs

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Calculate oxygen uptake

- Calculate the gradient of the trace

∆y/∆x

(gradient steeper during exercise)

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How does the tidal volume change with exercise?

Increases significantly

<p>Increases significantly</p>