What causes the alveoli to assume the smallest possible diameter in the lungs?
A) airway resistance
B) surface tension
C) gas pressure
D) capillary action
E) Poiseuille flow

Question

Quizplus · Accepted Answer

The surface tension created by the thin layer of fluid that lines the alveoli pulls inward, causing the alveoli to assume the smallest possible diameter. This is known as the law of Laplace, which states that the pressure inside a sphere is directly proportional to the surface tension and inversely proportional to the radius of the sphere. Therefore, as the alveoli become smaller in diameter, the pressure inside them increases, which could lead to collapse without the presence of surfactant.

What Causes the Alveoli to Assume the Smallest Possible Diameter