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Old 05-18-2012
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Lungs How surfactant increases compliance?

can anyone explain to me how surfactant can increase compliance???
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Old 05-18-2012
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Quote:
Originally Posted by mycoplasma View Post
can anyone explain to me how surfactant can increase compliance???
by preventing alveoli from collapsing........!!!!
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Old 05-18-2012
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Post This may help you.

Pulmonary surfactant increases compliance by decreasing the surface tension of water. The internal surface of the alveolus is covered with a thin coat of fluid. The water in this fluid has a high surface tension, and provides a force that could collapse the alveolus. The presence of surfactant in this fluid breaks up the surface tension of water, making it less likely that the alveolus can collapse inward. If the alveolus were to collapse, a great force would be required to open it, meaning that compliance would decrease drastically.
From Wikipedia. One of the reasons I love Wikipedia, it gives you a clear concept..
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Old 05-18-2012
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Remember Thyroxine and Prolactin increases Sufactant.

Insulin decreases it (Diabetes).

Pregnant women have less surfactants and there is risk of Respiratory distress syndrome in newborns....If glucocortirids are given to the mommy will reduce the risk of RDS.

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Quote:
Originally Posted by Alisom View Post
Pulmonary surfactant increases compliance by decreasing the surface tension of water. The internal surface of the alveolus is covered with a thin coat of fluid. The water in this fluid has a high surface tension, and provides a force that could collapse the alveolus. The presence of surfactant in this fluid breaks up the surface tension of water, making it less likely that the alveolus can collapse inward. If the alveolus were to collapse, a great force would be required to open it, meaning that compliance would decrease drastically.
From Wikipedia. One of the reasons I love Wikipedia, it gives you a clear concept..

thanks alot that helped alot
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Old 05-19-2012
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surfactant reduces the intermolecular force between liquid molecules lining the alveoli which reduces the collapsing pressure on the alveoli and keeps them open
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Old 05-20-2012
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Quote:
Originally Posted by Doc4Step1 View Post
Remember Thyroxine and Prolactin increases Sufactant.

Insulin decreases it (Diabetes).

Pregnant women have less surfactants and there is risk of Respiratory distress syndrome in newborns....If glucocortirids are given to the mommy will reduce the risk of RDS.

insulin doesnt decrease it, lack of steroids does. and insulin causes that lack of steroid, just as a C-section causes lack of steroids.

but the answer to the thread here is: it decreases surface tension (less inward pull, so its more free to expand).
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