Which Best Explains the Formation of a Goiter from Iodine

question 15

Multiple Choice

Which best explains the formation of a goiter from iodine deficiency?

• A) Lack of suppression from TRH causes more thyroid hormone to be released. This continual release stimulates the thyroid and eventually causes it to grow bigger.
• B) Lack of iodine causes an immune response in the thyroid causing it to swell.
• C) Lack of negative feedback from thyroid hormone causes more TRH to be released. This continual release stimulates the thyroid and eventually causes it to grow bigger.
• D) Positive feedback from excess thyroid hormone causes more TRH to be released. This continual release stimulates the thyroid and eventually causes it to grow bigger.

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