Multiple Choice
Which of the following sheds dead cells along with microbes attached to those cells?
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21. The Immune System
Physical Barriers in First-Line Defenses: Skin
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Which of the following is an example of a physical barrier in the body's first-line defenses?
A
White blood cells
B
Antibodies
C
Enzymes
D
Skin
Verified step by step guidance1
Understand the concept of the body's first-line defenses, which are the initial barriers that prevent pathogens from entering the body.
Recognize that physical barriers are structures that physically block or impede the entry of pathogens.
Identify examples of physical barriers, such as skin, mucous membranes, and cilia, which serve as the body's first line of defense.
Differentiate between physical barriers and other components of the immune system, such as white blood cells, antibodies, and enzymes, which are part of the body's second and third lines of defense.
Conclude that skin is a physical barrier because it acts as a protective layer that prevents pathogens from entering the body, making it a key component of the body's first-line defenses.
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