Consider the following diagram showing a bacterial infection within a human - VCE - SSCE Biology - Question 10 - 2012 - Paper 1
Question 10
Consider the following diagram showing a bacterial infection within a human.
Cells moving from the blood vessel towards the bacteria
A. are natural killer cells.
B... show full transcript
Worked Solution & Example Answer:Consider the following diagram showing a bacterial infection within a human - VCE - SSCE Biology - Question 10 - 2012 - Paper 1
Step 1
A. are natural killer cells.
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Answer
Natural killer (NK) cells are a type of lymphocyte involved in the immune response, primarily targeting infected or cancerous cells rather than bacteria. Therefore, this statement is not accurate in the context of this question.
Step 2
B. would act as phagocytes.
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Phagocytes, such as macrophages and neutrophils, are essential components of the innate immune system. They engulf and digest pathogens, including bacteria. This statement correctly describes the role of cells moving towards the bacterial infection.
Step 3
C. cause vasodilation of the blood vessel.
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Vasodilation refers to the widening of blood vessels, which is primarily caused by signaling molecules during an inflammatory response. However, the specific cells moving towards bacteria do not directly cause vasodilation; instead, they may respond to signals from other cells that do.
Step 4
D. release histamine in response to tissue damage.
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Histamine is released primarily by mast cells and basophils in response to tissue damage or pathogens. While cells moving towards the site of infection may exhibit various responses, they are not directly responsible for the release of histamine.
