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Questions and Answers
What are the two separate hormones produced by the thyroid gland?
What are the two separate hormones produced by the thyroid gland?
- T3 and T4 (correct)
- T2 and T3
- T1 and T2
- T4 and T5
How many iodine atoms are present in each molecule of T4?
How many iodine atoms are present in each molecule of T4?
- Five
- Three
- Four (correct)
- Two
What is the major use of iodine in the body?
What is the major use of iodine in the body?
- For muscle growth
- For blood circulation
- For bone development
- By the thyroid (correct)
Which hormones bind and transport T3 and T4?
Which hormones bind and transport T3 and T4?
Where are thyroid hormones synthesized and stored bound to proteins?
Where are thyroid hormones synthesized and stored bound to proteins?
What is the major derangement in iodine deficiency?
What is the major derangement in iodine deficiency?
What is the name of the hormone that is essential for normal thyroid function and contains iodine?
What is the name of the hormone that is essential for normal thyroid function and contains iodine?
What is the name of the hormone responsible for normal thyroid function and contains iodine?
What is the name of the hormone responsible for normal thyroid function and contains iodine?
What is the name of the hormone that is responsible for the alteration of thyroid function in iodine deficiency?
What is the name of the hormone that is responsible for the alteration of thyroid function in iodine deficiency?
What is the name of the hormone that binds and transports T3 and T4?
What is the name of the hormone that binds and transports T3 and T4?
What is the normal range for serum free T4?
What is the normal range for serum free T4?
What is the recommended action by the US Preventive Services Task Force (USPSTF) regarding routine screening of adults for thyroid disease?
What is the recommended action by the US Preventive Services Task Force (USPSTF) regarding routine screening of adults for thyroid disease?
What is the main advantage of measuring free T4 by the dialysis method?
What is the main advantage of measuring free T4 by the dialysis method?
Which hormone is the only metabolically active fraction of T4?
Which hormone is the only metabolically active fraction of T4?
What is the normal range for serum T3?
What is the normal range for serum T3?
What percentage of T4 and T3 are unbound?
What percentage of T4 and T3 are unbound?
What is the main purpose of measuring TSH in patients with low or high normal values?
What is the main purpose of measuring TSH in patients with low or high normal values?
What is the range of normal T4 in serum?
What is the range of normal T4 in serum?
What is the main advantage of measuring total T3 or T4?
What is the main advantage of measuring total T3 or T4?
What is the American Thyroid Association's recommendation regarding screening for thyroid disease in pregnant women?
What is the American Thyroid Association's recommendation regarding screening for thyroid disease in pregnant women?
What controls thyroid hormone secretion through a negative feedback mechanism?
What controls thyroid hormone secretion through a negative feedback mechanism?
What term refers to normal thyroid hormone production, regulated by TRH from the hypothalamus?
What term refers to normal thyroid hormone production, regulated by TRH from the hypothalamus?
Which thyroid hormone is more potent and rapid in its action than T4?
Which thyroid hormone is more potent and rapid in its action than T4?
What does calcitonin, secreted by the thyroid gland, regulate?
What does calcitonin, secreted by the thyroid gland, regulate?
What are the consequences of congenital hypothyroidism?
What are the consequences of congenital hypothyroidism?
What are the manifestations of hypothyroidism in adults?
What are the manifestations of hypothyroidism in adults?
What does hyperthyroidism lead to?
What does hyperthyroidism lead to?
What is included in the diagnostic evaluation for thyroid function?
What is included in the diagnostic evaluation for thyroid function?
What should patients being tested for thyroid function be assessed for?
What should patients being tested for thyroid function be assessed for?
Why can shellfish allergy be confused with iodine allergy?
Why can shellfish allergy be confused with iodine allergy?
Study Notes
Thyroid Hormone Regulation and Function
- The thyroid gland efficiently uptakes iodide from the blood and converts it into thyroid hormones.
- Thyroid hormone secretion is controlled by TSH from the anterior pituitary gland through a negative feedback mechanism.
- Euthyroid refers to normal thyroid hormone production, regulated by TRH from the hypothalamus.
- Thyroid hormones control cellular metabolic activity, with T3 being more potent and rapid in its action than T4.
- Thyroid hormones influence cellular processes, brain development, and are essential for normal growth.
- Calcitonin, secreted by the thyroid gland, regulates plasma calcium levels by increasing its deposition in bone.
- Congenital hypothyroidism results in intellectual disability and stunted growth, while hypothyroidism in adults manifests as lethargy and slow mentation.
- Hyperthyroidism leads to a greatly increased metabolic rate and is often associated with an enlarged thyroid gland (goiter).
- Diagnostic evaluation for thyroid function includes thyroid hormone measurements, thyroid scanning, biopsy, and imaging studies.
- Patients being tested for thyroid function should be assessed for iodine allergies and medications containing iodine.
- The relationship between shellfish allergy and iodine allergy is a long-held belief, but shellfish allergy is due to specific proteins in the shellfish and not iodine.
- Select medications can interfere with accurate testing of thyroid gland function and should be documented in the patient’s electronic health record.
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Description
Test your knowledge of thyroid hormone regulation and function with this quiz. Explore the role of thyroid hormones in cellular metabolism, growth, and brain development, as well as the impact of hypo- and hyperthyroidism on the body. Delve into diagnostic evaluations and considerations for testing thyroid function.
