Multiple Choice
Which is NOT a component or a process associated with innate immunity?
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21. The Immune System
Introduction to First-Line Defenses
Multiple Choice
Which portal of entry is the most commonly used by pathogens in the human body?
A
Skin
B
Gastrointestinal tract
C
Respiratory tract
D
Urogenital tract
Verified step by step guidance1
Understand the concept of 'portal of entry': It refers to the site through which pathogens enter the host's body. Common portals include the skin, respiratory tract, gastrointestinal tract, and urogenital tract.
Consider the respiratory tract: This is a major portal of entry because it is constantly exposed to the external environment through breathing, making it a common route for airborne pathogens.
Evaluate the skin as a portal of entry: While the skin is a barrier, it is less commonly used by pathogens unless there are cuts or abrasions.
Assess the gastrointestinal tract: This portal is used by pathogens that are ingested, but it is protected by stomach acid and enzymes.
Examine the urogenital tract: This is a specific portal for sexually transmitted infections, but it is not as commonly used as the respiratory tract for general pathogens.
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