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10 Questions

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Thyroid Gland Physiology and Hormones

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Questions and Answers

What percentage of iodine in the body is in the form of T4?

70%

90%

95% (correct)

80%

What is the main transport protein of thyroid hormones in the blood?

Thyroid-stimulating hormone (TSH)

Triiodothyronine (T3)

Thyroid-binding globulin (TBG) (correct)

Thyroxine (T4)

What is the half-life of T4 in individuals with hypothyroidism?

3-4 days

9-10 days (correct)

11-12 days

6-8 days

What is the recommended daily intake of iodine for pregnant women?

220 ug Signup and view all the answers

What is the effect of cold stress on T3 and T4 synthesis?

Increases T3 and T4 synthesis by 100% Signup and view all the answers

What is the mechanism of action of thyroid hormones at the cellular level?

Influence of gene transcription Signup and view all the answers

What is the role of TRH in the regulation of thyroid hormone synthesis?

Stimulates the release of TSH from the adenohypophysis Signup and view all the answers

What is the effect of TSH on thyroid hormone synthesis?

Stimulates thyroid hormone synthesis at various stages Signup and view all the answers

What is the percentage of unbound T3 in plasma?

0.3% Signup and view all the answers

What is the fate of T3 and T4 in the liver?

They are conjugated with glucuronic acids and sulphur-containing acids Signup and view all the answers