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20 Cards in this Set
- Front
- Back
Define TLC |
Total lung capacity |
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Define FRC |
Functional residual capacity |
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Define IRV |
Inspiratory reserve volume |
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Define ERV |
Expiratory reserve volume |
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Define RV |
Residual volume |
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Define IC |
Inspiratory capacity |
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Define TV |
Tidal volume |
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Define VC |
Vital capacity |
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Why is the concentration of expired air different to that of alveolar air? |
Alveolar air mixes with air in the dead space, which has equal concentrations to inspired air |
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Complete the equations: |
Pressure difference/R 1atm - Alveolar pressure |
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What's happens to the pressure difference in the interplural space during inspiration, and what is the effect? |
The pressure becomes more subatmospheric from -5 to -8cmH2O. This lets the lungs stick to the chest wall more readily |
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What muscles are used for inspiration only during excercize? |
Sternocleidomastoid |
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What is the term given to the 'stretchability' of the lungs? |
Lung compliance |
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What is the effect of the water lining of the alveoli? |
Surface tension acts inwards, favouring alveolar collapse |
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What's the equation to work out pressure from surface tension? |
P = ST/radius |
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What would happen if a larger alveolus and smaller alveolus were connected and had equal surface tension? |
Pressure would be higher in the small alveolus and air would move into the larger one, collapsing the small one |
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How does the body prevent alveolar collapse? |
Surfactant |
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What is the most common component of surfactant? |
Dipalmitoyl phosphatidylcholine |
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Where is surfactant secreted from? |
Type 2 alveolar cells |
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What does surfactant do? |
Reduces surface tension by disrupting the hydrogen bonds between water molecules |