21. The Immune System
Physical Barriers in First-Line Defenses: Skin
Multiple Choice
Multiple ChoiceExamples of 1st line defenses to infection which are components of the innate immune system include all of the following except?
A
Unbroken skin.
B
Phagocytosis of a pathogen by an immune cell.
C
Digestive enzymes in saliva.
D
Destructive acids in gastric juices.
E
Naturally occurring human microbiome.
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