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21. The Immune System - Part 1 of 2
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Problem 11
21. The Immune System - Part 1 of 2
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21. The Immune System / Overview of Host Defenses / Problem 1
Problem 1
Which of the following is NOT considered a line of defense against pathogens in the human body?
A
Innate immune system
B
Mechanical barriers
C
Digestive enzymes
D
Chemical barriers
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