The surfactant doesn't allow the sides of the alveoli form sticking together. Infants that are born very early don't make surfactant and so have many problems.
They produce surfactant, a substance that reduces surface tension. Alveoli are very small, only 80 nanometers wide, and are flat. Therefore they have a tendency to curl up. The surfactant reduces this tendency, hence keeps the alveoli from collapsing.
they are involved in keeping alveoli from collapsing
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A union member involved in keeping a union going or anyone who is a politician.
vitamin k.
We are currently in Afghanistan fighting and peace-keeping
screw u
a crap load
It helps by keeping people up to date on particular subjects they are involved in
Humans need calcium and vitamin D to keep bones healthy.
My daughter is involved in a movement to decimate the local park by keeping its grounds clean.
Gravity is the only one necessary. Which is lucky, because gravity is the only one there is.