The components of the second line of defense against microbes may be characterized as
A) responders to invasion.
B) passive barriers.
C) mechanisms to strengthen the first line of defense.
D) detecting the unique features of specific pathogens.
E) both passive barriers and detecting specific pathogen features.

Question

Quizplus · Accepted Answer

The second line of defense includes immune cells that respond to invasion, such as macrophages, neutrophils, and natural killer cells.

The Components of the Second Line of Defense Against Microbes