The diagrams below outline the sequence of events involved in an allergic response - VCE - SSCE Biology - Question 5 - 2007 - Paper 1
Question 5
The diagrams below outline the sequence of events involved in an allergic response.
First encounter with allergen
* allergen
* b cell
Replication and differ... show full transcript
Worked Solution & Example Answer:The diagrams below outline the sequence of events involved in an allergic response - VCE - SSCE Biology - Question 5 - 2007 - Paper 1
Step 1
a. Name one well-recognised allergen.
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Answer
One well-recognised allergen is pollen.
Step 2
b. i. Identify the organelle that is abundant in the cytosol of the plasma cell.
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Answer
The organelle that is abundant in the cytosol of the plasma cell is the rough endoplasmic reticulum.
Step 3
b. ii. Explain one specific role of this organelle in the plasma cell.
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The rough endoplasmic reticulum plays a critical role in the synthesis of proteins, specifically antibodies in the case of plasma cells. It is involved in translating the mRNA into polypeptides, which are then properly folded and modified.
Step 4
c. i. Name the type of cell represented by cell K.
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Cell K represents a mast cell.
Step 5
c. ii. Name one such region of the body.
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One region of the body where type K cells can produce localized allergic responses is the skin.
Step 6
c. iii. Describe one effect of the release of histamine by cell K into the surrounding extracellular fluid or bloodstream.
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The release of histamine by cell K causes vasodilation and increase in vascular permeability, leading to symptoms of inflammation such as redness and swelling in the affected area.
Step 7
c. iv. Name the process by which histamine is released by cell K.
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The process by which histamine is released by cell K is called degranulation.
