Graves' disease is an autoimmune disease in which the production of thyroid hormones by thyroid cells is unregulated - VCE - SSCE Biology - Question 20 - 2012 - Paper 1
Question 20
Graves' disease is an autoimmune disease in which the production of thyroid hormones by thyroid cells is unregulated. The following diagrams outline what occurs in r... show full transcript
Worked Solution & Example Answer:Graves' disease is an autoimmune disease in which the production of thyroid hormones by thyroid cells is unregulated - VCE - SSCE Biology - Question 20 - 2012 - Paper 1
Step 1
A. TSH inhibits the production of thyroid hormones.
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Answer
This statement is not supported by the diagrams. TSH typically stimulates hormone synthesis, suggesting that it does not inhibit production.
Step 2
B. positive feedback control occurs with regulated cells.
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Answer
The diagrams suggest feedback control is present, but they are not necessarily indicative of a positive feedback mechanism. Thus, this claim is not evidently true.
Step 3
C. the presence of autoantibodies overstimulates the thyroid.
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This statement aligns with the information provided in the diagrams showing that autoantibodies can lead to unregulated production of thyroid hormones in Graves' disease.
Step 4
D. individuals with Graves' disease lack appropriate receptors on thyroid cells.
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This claim is not supported by the provided diagrams, which imply presence of receptors but demonstrate their inappropriate function due to autoantibodies.
