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Lectures on respiratory physiology Mechanics of Breathing II

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Patterns of gas flow in tubes

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Poiseuille equation for laminar flow

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Patterns of gas flow in tubes

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The Reynolds number

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Pressures during the breathing cycle

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Number of airways increases rapidly with generation

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Most resistance is in the medium sized airways

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Airway resistance falls with increasing lung volume

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Flow – volume curves

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Isovolume pressure-flow curves

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Mechanism of dynamic compression

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Flow – volume curves

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Flow through collapsible tubes

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Mechanism of dynamic compression

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Work done on the lung during breathing

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