Multiple Choice
Fever is initiated by chemicals called:
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19. Innate Immunity
Introduction to Innate Immunity
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Which of the following is considered a primary physical barrier in the innate immune system?
A
Intact skin
B
Lysozyme in tears
C
Stomach acid (HCl)
D
Interferons
Verified step by step guidance1
Understand that the innate immune system includes physical, chemical, and cellular defenses that provide the first line of protection against pathogens.
Identify what is meant by a 'primary physical barrier'—this refers to a structural feature that physically blocks pathogen entry into the body.
Evaluate each option: 'Intact skin' acts as a tough, impermeable layer preventing microbial invasion, making it a physical barrier.
'Lysozyme in tears' and 'stomach acid (HCl)' are chemical barriers because they destroy or inhibit microbes through chemical means.
'Interferons' are proteins involved in cellular defense mechanisms, not physical barriers.
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