Anatomy of the Thyroid Gland
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Questions and Answers

What is the origin of parafollicular cells?

  • Mesoderm
  • Ectoderm
  • Neural crest or endoderm (correct)
  • Follicular cells
  • What is the function of calcitonin secreted by parafollicular cells?

  • Inhibits osteoclast activity (correct)
  • Stimulates osteoclast activity
  • Regulates thyroid hormone production
  • Stimulates thyroid hormone production
  • What is the trigger for calcitonin secretion?

  • Elevated thyroid hormone levels
  • Elevated blood Ca+2 levels (correct)
  • Elevated parathyroid hormone levels
  • Elevated blood glucose levels
  • What is the function of iodination of tyrosyl residues?

    <p>Formation of T3 and T4</p> Signup and view all the answers

    What is the concentration of iodide in the thyroid follicle compared to the blood?

    <p>30-fold higher</p> Signup and view all the answers

    What is the role of thyroglobulin in thyroid hormone production?

    <p>Stores thyroid hormones</p> Signup and view all the answers

    What is the number of tyrosyl residues in thyroglobulin?

    <p>140</p> Signup and view all the answers

    What promotes the production of thyroid hormones?

    <p>TSH</p> Signup and view all the answers

    What is the sequence of thyroid hormone production?

    <p>Thyroglobulin production, iodination, T3 and T4 formation</p> Signup and view all the answers

    What is the process by which iodinated thyroglobulin is broken down?

    <p>Endocytosis</p> Signup and view all the answers

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