The first line of defence against pathogens includes the
A - VCE - SSCE Biology - Question 15 - 2014 - Paper 1
Question 15
The first line of defence against pathogens includes the
A. activation of helper T cells.
B. presence of acid in the stomach.
C. release of histamine from mast cells... show full transcript
Worked Solution & Example Answer:The first line of defence against pathogens includes the
A - VCE - SSCE Biology - Question 15 - 2014 - Paper 1
Step 1
A. activation of helper T cells.
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Answer
This option refers to the activation of specific immune responses and is not part of the innate immune system, which is considered the first line of defense.
Step 2
B. presence of acid in the stomach.
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Answer
This is correct. The stomach acid provides a hostile environment for pathogens, thus serving as a physical barrier and part of the innate immune response.
Step 3
C. release of histamine from mast cells.
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Answer
While histamine is involved in inflammatory responses, it is part of the secondary immune response and not considered a first line of defense mechanism.
Step 4
D. production of interferon from virus-infected cells.
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Answer
This is primarily involved in the antiviral response and is not part of the first line of defense against pathogens.
