What is the fatty substance that maintains the inflation of the alveoli between inspirations?

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Grade: Education Subject: biology
What is the fatty substance that maintains the inflation of the alveoli between inspirations?
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The answer is surfacant. Its a fluid secreted by the cells of the alveoli( the tiny air sacs in the lungs) that serves to reduce the surface tension of pulmonary fluid. Surfacant also contributes to the elastic properties of pulmonary tissue , preventing the alveoli from collapsing.