The first line of defense against infection is __________?
A)cellular components
B)complement proteins
C)natural killer cells
D)None of the above answers are correct

Question

Quizplus · Accepted Answer

The first line of defense against infection includes physical and chemical barriers such as skin, mucous membranes, and secretions like saliva and stomach acid, rather than cellular components, complement proteins, or natural killer cells, which are part of the innate or adaptive immune responses.

The First Line of Defense Against Infection Is __________