First-line defence mechanisms in humans include
A - VCE - SSCE Biology - Question 19 - 2009 - Paper 1
Question 19
First-line defence mechanisms in humans include
A. development of fever.
B. action of phagocytes.
C. use of antibiotics.
D. presence of cilia.
Worked Solution & Example Answer:First-line defence mechanisms in humans include
A - VCE - SSCE Biology - Question 19 - 2009 - Paper 1
Step 1
A. development of fever.
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Answer
Fever is not considered a first-line defense mechanism; instead, it is part of the body's systemic response to infection.
Step 2
B. action of phagocytes.
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Answer
Phagocytes play a crucial role in the immune response as they engulf and digest pathogens, but they are part of the second-line defenses rather than the first line.
Step 3
C. use of antibiotics.
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Answer
Antibiotics are not a natural first-line defense mechanism in the body; they are medications used to treat infections.
Step 4
D. presence of cilia.
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Answer
The presence of cilia is a correct answer as they help trap and move pathogens out of the respiratory tract, acting as a first-line defense.
