Decreased surfactant production in the preterm lung is a problem because
A) surfactant keeps the alveoli open during expiration.
B) surfactant causes increased permeability of the alveoli.
C) surfactant dilates the bronchioles, decreasing airway resistance.
D) surfactant provides transportation for oxygen to enter the blood supply.

Question

Quizplus · Accepted Answer

Surfactant prevents the alveoli from collapsing each time the infant exhales, thus reducing the work of breathing. It does not affect the bronchioles. By keeping the alveoli open, surfactant permits enhanced oxygen exchange. Infants treated with surfactant have higher survival rates.

Decreased Surfactant Production in the Preterm Lung Is a Problem