thyroid gland, radioisotopic destruction of the thyroid gland by the use of
I, and surgical
removal of the thyroid gland.
After considering all the options, especially the possible effects of radiation on gamete
development, Michael chose surgery. Following successful surgery, Michael was prescribed
synthetic thyroid hormone to ensure that his body was receiving adequate thyroid hormone
and told to return within 2 months for a follow-up evaluation of circulating thyroid hormone
concentrations. He was also cautioned to carefully monitor his calcium intake.
Respond to the following prompts about this case:
1. Define the bold terms in the text. (8 points)
2. Thyroid hormones exert their effects on cells in a manner similar to steroid hormones;
describe the mechanism of action of thyroid hormones. ( 2 points)
3. Why would an imbalance in thyroid hormones have such widespread effects on the body? (2