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20 Cards in this Set

  • Front
  • Back

Define TLC

Total lung capacity

Define FRC

Functional residual capacity

Define IRV

Inspiratory reserve volume

Define ERV

Expiratory reserve volume

Define RV

Residual volume

Define IC

Inspiratory capacity

Define TV

Tidal volume

Define VC

Vital capacity

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

Complete the equations:

Flow =
Pressure difference of lungs =

Pressure difference/R


1atm - Alveolar pressure

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

What muscles are used for inspiration only during excercize?

Sternocleidomastoid

What is the term given to the 'stretchability' of the lungs?

Lung compliance

What is the effect of the water lining of the alveoli?

Surface tension acts inwards, favouring alveolar collapse

What's the equation to work out pressure from surface tension?

P = ST/radius

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

How does the body prevent alveolar collapse?

Surfactant

What is the most common component of surfactant?

Dipalmitoyl phosphatidylcholine

Where is surfactant secreted from?

Type 2 alveolar cells

What does surfactant do?

Reduces surface tension by disrupting the hydrogen bonds between water molecules