Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
A scab forming over a cut
B
Skin acting as a barrier to prevent pathogen entry
C
White blood cells attacking bacteria
D
Hair trapping dust and microbes before they enter the body
Understanding the Answer
Let's break down why this is correct
Answer
The integumentary system protects the body by acting as a physical barrier that stops microbes from entering and by releasing substances that kill or inhibit them. For example, the skin’s outer layer, the epidermis, is tightly packed and contains keratinocytes that produce antimicrobial peptides such as defensins, which directly kill bacteria that touch the skin. This barrier works instantly and does not need prior exposure to the pathogen, making it an innate defense. Thus, the skin’s combination of a tough outer layer and antimicrobial secretions best illustrates this innate immune function.
Detailed Explanation
Skin forms a continuous layer that physically blocks germs. Other options are incorrect because People often think a scab stops germs early; Some students think fighting germs inside the body is the skin’s job.
Key Concepts
Innate Immune Defenses
Integumentary System
Pathogen Defense
Topic
Innate Immune Defenses
Difficulty
medium level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1How do the integumentary structures contribute to the innate immune response in animals?
hardBiological-sciences
Practice
2
Question 2What is the primary reason that the integumentary system, including skin and hair, is considered the first line of defense against pathogens?
easyBiological-sciences
Practice
3
Question 3Why is the integumentary system critical in the body's first line of defense against pathogens?
easyBiological-sciences
Practice
4
Question 4Which of the following examples best illustrates the function of the innate immune response?
mediumBiological-sciences
Practice
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