As the surface tension of the alveolus increases, what is the likely effect on its size?

When considering the effects of increased surface tension in the alveolus, it's important to note how surface tension directly influences the behavior of alveolar structures. Surface tension naturally resists the expansion of alveoli during inhalation.

As the surface tension increases, it creates a more substantial opposing force against the expansion of the alveolus when a person breathes in. Consequently, this resistance causes the alveolus to decrease in size or collapse partially, which leads to less air being present and thereby increases the work necessary for the lungs to expand and inhale. This increased work of breathing can strain the respiratory muscles and potentially lead to respiratory distress if the situation is not managed.

This relationship illustrates why the alveolus, under conditions of increased surface tension, would decrease in size and complicate the mechanics of breathing.