Thyroid Hormones and Their Functions Quiz
30 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What enzyme promotes the oxidation of iodine in the formation of iodine capable of combining with tyrosine?

  • Thyroid peroxidase (correct)
  • Lipase
  • Amylase
  • Insulinase
  • What is the process of binding iodine with the thyroglobulin molecule called?

  • Tyrosination
  • Organification (correct)
  • Iodination
  • Thyroxination
  • Which molecule contains up to 30 thyroxine molecules and a few triiodothyronine molecules?

  • Thyroglobulin (correct)
  • Thyroid peroxidase
  • Thyronine
  • Insulin
  • What is the first step in the iodization of tyrosine during the process of iodination and coupling?

    <p>Monoiodotyrosine (A)</p> Signup and view all the answers

    What molecule is responsible for the 'organification' of the thyroglobulin with iodine?

    <p>Iodinase (D)</p> Signup and view all the answers

    What substance accompanies thyroid peroxidase in promoting the oxidation of iodide ions to iodine?

    <p>Hydrogen peroxide (D)</p> Signup and view all the answers

    Which hormones are commonly known as T4 and T3?

    <p>Triiodothyronine and thyroxine (A)</p> Signup and view all the answers

    What happens to the basal metabolic rate (BMR) when there is a complete lack of thyroid secretion?

    <p>It decreases to 40-50% below normal (B)</p> Signup and view all the answers

    Which hormone controls thyroid secretion primarily?

    <p>Thyroid-stimulating hormone (TSH) (A)</p> Signup and view all the answers

    What percentage of metabolically active hormones secreted by the thyroid gland is thyroxine?

    <p>93% (D)</p> Signup and view all the answers

    What is the primary function of triiodothyronine (T3) and thyroxine (T4)?

    <p>Increase the BMR (C)</p> Signup and view all the answers

    Which hormone is also secreted by the thyroid gland apart from T3 and T4?

    <p>Calcitonin (B)</p> Signup and view all the answers

    What is the main effect of thyroid hormones on gene transcription?

    <p>Activate transcription of large numbers of genes (C)</p> Signup and view all the answers

    How does thyroid hormone affect glucose metabolism?

    <p>Stimulates rapid uptake of glucose by the cells (B)</p> Signup and view all the answers

    Which of the following statements about fat metabolism under thyroid hormone influence is correct?

    <p>Fat metabolism is enhanced (D)</p> Signup and view all the answers

    What is the result of the overall increase in cellular metabolic enzymes caused by thyroid hormone?

    <p>Enhanced synthesis of structural proteins (C)</p> Signup and view all the answers

    Why are thyroid hormones released slowly to tissue cells?

    <p>Because of high affinity of plasma-binding proteins for thyroid hormones (C)</p> Signup and view all the answers

    How does the effect of thyroid hormone on carbohydrate metabolism impact insulin secretion?

    <p>Increases insulin secretion (A)</p> Signup and view all the answers

    What effect does increased thyroid hormone have on the concentrations of cholesterol, phospholipids, and triglycerides in the plasma?

    <p>Decreases cholesterol, phospholipids, and triglycerides (B)</p> Signup and view all the answers

    What is the primary role of lipids when they are mobilized rapidly from fat tissue?

    <p>Accelerate the oxidation of free fatty acids by cells (A)</p> Signup and view all the answers

    How does hyperthyroidism typically affect the size of the thyroid gland in patients?

    <p>Increases the size significantly (C)</p> Signup and view all the answers

    Which protein has the highest binding strength for thyroxine transport in the blood?

    <p>Throxine-binding globulin (TBG) (C)</p> Signup and view all the answers

    What effect does increased thyroid hormone have on the size of the thyroid gland?

    <p>Triples the size (A)</p> Signup and view all the answers

    What physiological consequence results from the rapid mobilization of lipids from fat tissue?

    <p>Accelerates the oxidation of free fatty acids by cells (B)</p> Signup and view all the answers

    What is the underlying cause of hyperthyroidism in Graves' disease?

    <p>Antibodies binding to thyroid cell receptors (B)</p> Signup and view all the answers

    What do thyroid-stimulating immunoglobulins (TSIs) do in individuals with Graves' disease?

    <p>Promote thyroid growth and hormone production (A)</p> Signup and view all the answers

    How does Graves' disease affect the size of the thyroid gland?

    <p>It enlarges the thyroid gland (C)</p> Signup and view all the answers

    What is a common symptom associated with a goiter?

    <p>Swollen neck (B)</p> Signup and view all the answers

    What do radioactive iodine uptake studies indicate in hyperplastic glands?

    <p>Excess thyroid hormone secretion (C)</p> Signup and view all the answers

    In Graves' disease, what role do TSIs play in the production of thyroid hormones?

    <p>Stimulate excess hormone production (D)</p> Signup and view all the answers

    More Like This

    Endocrine 2
    28 questions

    Endocrine 2

    WellBeingFluorine avatar
    WellBeingFluorine
    Thyroid Hormones Effects Quiz
    5 questions
    Thyroid Hormones and Their Functions
    18 questions

    Thyroid Hormones and Their Functions

    ResourcefulChalcedony7066 avatar
    ResourcefulChalcedony7066
    Use Quizgecko on...
    Browser
    Browser