What is the purpose of a watery fluid in the lungs that contains a surfactant, which is a detergent-like subst?

a. It prevents the alveolar surfaces from adhering to one another.
b. It stimulates oxygen uptake by the alveoli.
c. It sticks the epithelial cells of the alveolus and the endothelial cells that form the wall of each capillary together.
d. It prevents damage to the lungs caused by smoking.

A, they essentially stop the lungs from collapsing on themselves

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3 Responses to What is the purpose of a watery fluid in the lungs that contains a surfactant, which is a detergent-like subst?

  1. BIGgourami says:

    A, they essentially stop the lungs from collapsing on themselves
    References :

  2. princepessa commestibile appiccicosa dolce says:

    a–surfactant is a medication that is given to premature newborn babies to help their lungs "develop" and enable the lungs to function–of course this is man made when given to premature babies
    References :

  3. Piet S says:

    Basically it is to save energy. The surface of the lungs is expanding when you inhale and energy is needed to overcome the work done by surface tension (the fluid in the lungs wants to minimize its surface, the surface tension is the force over a length responsible for minimizing the surface). That will require very strong muscles to expand the chest if the surface tension is high. At exhaling the surface comes down and the lungs will collapse due to gravity and surface tension again until the rib cage is at its minimal volume.
    So the higher the surface tension the more muscle is needed to overcome it. It can be a big problem for premature children, that don’t have a surfactant yet and weak musculature in the chest.
    References :

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