Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Sebum
B
Mucus
C
Skin cells
D
Hair follicles
Understanding the Answer
Let's break down why this is correct
Answer
The chemical barrier of the skin is the main line of defense against microbes. It includes the acidic pH of the skin surface, sebum from sebaceous glands, and sweat from sweat glands. These substances create an environment that is hostile to bacteria and fungi, preventing their growth. For example, the slightly acidic skin pH (around 4. 5–5.
Detailed Explanation
The oil that comes from skin glands carries fatty acids that stop germs from growing. Other options are incorrect because Mucus traps germs, but it lives in tubes like the nose, not on the skin; Skin cells make a hard outer layer that blocks germs, but they don’t kill them.
Key Concepts
Chemical barriers to pathogens
Physical barriers to pathogens
Innate immune response
Topic
Barriers to Pathogens
Difficulty
easy level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1Which of the following statements best describes the role of skin in pathogen defense?
easyBiological-sciences
Practice
2
Question 2Which of the following substances serves as a physical and chemical barrier against pathogens, and why is it effective in preventing infections?
hardBiological-sciences
Practice
3
Question 3Skin barriers in the body are to pathogens as A: mucous membranes are to ?
mediumBiological-sciences
Practice
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