15 Questions
Which amino acid is used to make thyroid hormones?
Tyrosine
What converts T4 to the active form T3?
Iodothyronine deiodinase
How do thyroid hormones work in target cells?
By affecting gene expression
Which thyroid hormone is predominant in the blood?
T4
What is the essential component of thyroid hormones?
Iodide ions
What do thyroid hormones promote?
Protein synthesis
What is the enzyme that converts T4 to T3?
Iodothyronine deiodinase
What stimulates the pituitary to release thyroid-stimulating hormone (TSH)?
Thyrotropin-releasing hormone (TRH)
What happens when the supply of iodine is adequate for the thyroid gland?
Thyroid hormones can be made and their presence turns off synthesis of thyroid-stimulating hormone
What is a classic sign of iodine deficiency?
Goiter
What are the adverse effects of iodine deficiency on growth and development?
Multiple adverse effects on growth and development
What does severe iodine deficiency cause?
Gross cognitive impairments, short stature, deafness and spasticity
What are the symptoms of acute iodine poisoning?
GI irritation, abdominal pain, nausea, vomiting, diarrhea, cardiovascular symptoms, coma, cyanosis
What happens with a large excess of iodine?
Inhibits thyroid hormone production, leading to increased TSH stimulation for thyroid growth and goiter
What stimulates thyroid hypertrophy and hyperplasia in response to iodine deficiency?
Increased TSH secretion
Test your knowledge about iodine and its role in the body with this quiz. Explore its absorption, role in thyroid hormone production, and impact on gene expression.
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