Surface Tension in the Lungs

Surface tension is the tendency of molecules in a fluid to be pulled toward the center of the fluid. It is measured as an energy per unit area (J/m2) or as the force across a line (N/m). (Adamson, 1990, Measurement binder)

Surfactants are substances that reduce surface tension.

Why are surfactants important in the lungs?

Components of lung surfactant:

DPPC is the chemical that actually reduces surface tension.

What does surfactant look like in the lungs?