Quiz 8 Spring 2010 Key

Quiz 8 Spring 2010 Key - (e) decreased uptake of iodine by...

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HUN 4221 Quiz 8 Spring 2010 Multiple Choice (2 points) 1. Male laboratory rats placed on a selenium-deficient diet were observed to develop muscle degeneration, inability to produce offspring, and enlarged thyroid glands. Select the correct explanation(s) for these observations. (a) Selenium is required as an antioxidant to maintain muscle membrane integrity (b) Sperm contain a selenium-containing protein as a structural component (c) Production of thyroid hormones is dependent on a selenium-containing enzyme (d) All of the above (e) None of the above When diets chronically deficient in iodine are consumed, which of the following metabolic responses occurs? (a) reduced release of thyroid stimulating hormone due to high blood levels of thyroxine (b) increased iodine excretion by the kidneys (c) decreased release of thyrotropin-releasing hormone from hypothalamus (d) increased release of thyroid stimulating hormone due to low levels of thyroxine
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Unformatted text preview: (e) decreased uptake of iodine by the thyroid gland True or False (1 point) Individuals with Keshans disease would have impaired glutathione peroxidase activity. (a) True (b) False Selenium containing proteins are important oxidizing agents in the body functioning to oxidize water to hydrogen peroxide. (a) True (b) False When a pregnant womans diet is severely deficient in iodine during early gestation the developing infant may be mentally retarded and deaf mute. (a) True ( b) False The efficiency of iodide uptake by the thyroid gland decreases in response to a deficiency. (a) True (b) False Iodine therapy has never been shown to reduce the size of a goiter once it is established. (a) True (b) False Selenium is required component of the enzyme thyroxine 5deiodinase which is required for the conversion of T4 to T3. (a) True (b) False...
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Quiz 8 Spring 2010 Key - (e) decreased uptake of iodine by...

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