Surfactant proteins A and D provide innate resistance by:
A)initiating the complement cascade.
B)promoting phagocytosis.
C)secreting mucus.
D)synthesizing lysosomes.

Question

Quizplus · Accepted Answer

The lung also produces and secretes a family of glycoproteins, collectins, which includes surfactant proteins A through D and mannose-binding lectin. Collectin binding facilitates recognition of the microorganism by macrophages, enhancing macrophage attachment, phagocytosis, and killing.

Surfactant Proteins a and D Provide Innate Resistance By