Multiple Choice
What is the most effective method for a nursing assistant to prevent infection as part of innate immunity?
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21. The Immune System
Introduction to First-Line Defenses
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Which of the following is not a portal of entry for pathogens?
A
Respiratory tract
B
Gastrointestinal tract
C
Lymph nodes
D
Skin
Verified step by step guidance1
Understand the concept of 'portal of entry': A portal of entry is a site through which pathogens enter the body. Common portals include mucous membranes, skin, and parenteral routes.
Identify the common portals of entry: The respiratory tract and gastrointestinal tract are typical portals of entry for pathogens, as they are exposed to the external environment and have mucous membranes.
Consider the skin: The skin is a barrier to pathogens, but it can become a portal of entry if there are cuts, abrasions, or punctures.
Evaluate the lymph nodes: Lymph nodes are part of the immune system and are not exposed to the external environment. They do not serve as a portal of entry for pathogens.
Conclude which option is not a portal of entry: Based on the understanding that lymph nodes are internal and part of the immune system, they are not a portal of entry for pathogens.
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