Multiple Choice
Why are smokers more likely to have infections with respiratory pathogens?
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21. The Immune System
Introduction to Innate Immunity
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Which of the following is not a component of the second line of defense in innate immunity?
A
Phagocytic cells
B
Inflammatory response
C
Antimicrobial proteins
D
Skin barrier
Verified step by step guidance1
Understand the concept of innate immunity, which is the body's first line of defense against pathogens and is non-specific.
Recognize that the second line of defense in innate immunity includes mechanisms that act once the pathogen has bypassed the first line of defense, such as the skin barrier.
Identify the components of the second line of defense: phagocytic cells (like macrophages and neutrophils), the inflammatory response, and antimicrobial proteins (such as interferons and complement proteins).
Note that the skin barrier is part of the first line of defense, which includes physical and chemical barriers that prevent pathogens from entering the body.
Conclude that the skin barrier is not a component of the second line of defense, as it serves as a physical barrier in the first line of defense.
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