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Thyroid Hormone Effects on Human Body

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Questions and Answers

Which of the following thyroid hormones is inactive until converted into its active form in the tissues?

T4 (correct)

TSH

TRH

What is the primary mechanism by which TSH stimulates the activity of follicle cells?

↓ NIS activity

↑ thyroglobulin breakdown (correct)

↓ thyroglobulin breakdown

↓ coupling of iodide to tyrosine

Which of the following conditions would most likely decrease the amount of binding protein in the plasma?

Graves' disease

Hyperthyroidism

Hypothyroidism

TBG deficiency (correct)

What is the primary role of thyroxine-binding proteins in the blood?

To carry T3 and T4 in the blood Signup and view all the answers

Which of the following hormones exerts negative feedback on the hypothalamus?

T3 and T4 Signup and view all the answers

What is the effect of T3 on metabolic rate?

It increases metabolic rate Signup and view all the answers

Which of the following drugs would most likely affect the binding of thyroxine to its protein transporter?

Glucocorticoids Signup and view all the answers

What is the primary mechanism by which TRH regulates thyroid hormone production?

It regulates the release of TSH from the anterior pituitary Signup and view all the answers

Which of the following is a characteristic of Hashimoto's thyroiditis?

Underproduction of T3 and T4 Signup and view all the answers

What is the primary purpose of thyroid function tests?

To assess thyroid hormone production and diagnose thyroid dysfunction Signup and view all the answers