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SURFACTANT EXPLAINED.docx

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Department
Kinesiology & Health Science
Course
KINE 3012
Professor
Michael Connor
Semester
Winter

Description
SURFACTANT (PAGE 26) The law of laplace states Pressure = 2 (surface tension) / radius. No surfactant: If there is no surfactant, and if we say that both the surface tension of the smaller alveoli and the bigger alveoli are equal, but the bigger alveoli has a bigger radius then the smaller alveoli, then we can say using the formula that the smaller alveoli has a higher pressure than the bigger one. (If smaller alveoli has a radius of 1, and bigger has a radius of 2, then from putting these numbers into the formula, the smaller alveoli yields a bigger pressure.) So since the smaller has a bigger pressure, the air will flow from the smaller alveoli (B) to the bigger alveoli (A). What will then happen is that eventually, the smaller alveoli will just collapse and die down into the bigger alveoli and they will become one. - Makes gas exchan
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