Multiple Choice
In the context of first-line defenses (normal microbiota), which statement best describes the routine respiratory flora in a healthy person?
21. The Immune System
First-Line Defenses: Normal Microbiota
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What is the role of normal microbiota in preventing disease?
A
They directly attack and destroy pathogens.
B
They increase the permeability of the skin to prevent pathogen entry.
C
They compete with pathogens for nutrients and space.
D
They produce antibodies to neutralize pathogens.
Verified step by step guidance1
Understand the concept of normal microbiota: These are the microorganisms that reside in and on our bodies without causing disease. They play a crucial role in maintaining health.
Recognize the competitive exclusion principle: Normal microbiota compete with potential pathogens for nutrients and space, effectively preventing the pathogens from establishing themselves and causing disease.
Consider the environment created by normal microbiota: They can alter the local environment, such as pH levels, making it less hospitable for pathogenic organisms.
Explore the production of antimicrobial substances: Some normal microbiota produce substances that inhibit or kill pathogens, further preventing disease.
Reflect on the immune system interaction: Normal microbiota can stimulate the immune system, enhancing its ability to respond to pathogens.
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