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22 Cards in this Set

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What does inflation of the lungs do to water concentration
increases
What is the relationship between water concentration and surface tension
direct
What is the relationship between surfactant concentration and surface tension
inverse
What does deflation of the lungs do to water concentration
decreases
What does inflation of the lungs do to surfactant concentration
decreases
What does deflation of the lungs do to water concentration
decreases
What is the relationship between surfactant concentration and surface tension
inverse
What is the Law of LaPlace
2 tension/ radius
What are the functions of surfactant
stabilizes the alveoli
decreases work of inspiration
keeps alveoli dry
What are the three phospholipids that make up surfactant
phosphatidylglycerol
sphingomyelin
phosphotidylcholine
3 different names for phosphotidylcholine
Dipalmitoyl PC (DPPC)
Dipalmitoyl lecithin
lecithin
Important for helping to spread surfactant over the entire fluid lining
phosphotidylglycerol
Three pathological lung changes caused by low surfactant levels
atelectasis
pulmonary edema
pulmonary hemorrhage
What are four possible causes of surfactant deficiency
Premature lungs
Hypoxia
Decreased blood supply
Prolonged MV at same TV
What conditions will decrease the compliance of the thorax
skeletal (kyphoscoliosis)
abdominal
Obesity
Pregnancy
What is the compliance of the lung-thorax complex
0.1/cm H20
Point at which the recoil of the thorax and lungs offset each other
FRC
Point at which the thorax is neutral
2/3 TLC
Range at which the thorax will actually have a negative recoil
>2/3 TLC
Range at which thorax recoil will oppose lung recoil
< 2/3 TLC
Where does passive inspiration begin and end
begins at max expiration and ends at FRC
Where does passive expiration begin and end
begins at max inspiration and ends at FRC