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Physioex: Endocrine System Lab Quiz Part 1 (metabolism)

13 Questions
Endocrine System Quizzes & Trivia

Questions from the pre-lab quiz, post-lab quiz, and possibly more from the section.

Questions and Answers
  • 1. 
    Thyroid-stimulating hormone (TSH) is
    • A. 

      Produced in the pituitary gland.

    • B. 

      Carried through the blood to its target tissue, the hypothalamus.

    • C. 

      The primary regulator of thyrotropin secretion.

    • D. 

      Secreted by the posterior pituitary.

  • 2. 
    An injection of TSH to an otherwise normal animal will cause which of the following?
    • A. 

      Hypothyroidism

    • B. 

      Goiter development

    • C. 

      Decreased levels of T4 secretion

    • D. 

      Increased levels of TRH secretion

  • 3. 
    Thyroxine is
    • A. 

      Secreted by the thyrotropin gland, located in the neck.

    • B. 

      Controlled by T4 secreted from the hypophysis.

    • C. 

      Also known as triiodothyromine.

    • D. 

      The most important hormone for maintaining the metabolic rate and body temperature.

  • 4. 
    Thyrotropin-releasing  hormone (TRH) is
    • A. 

      The stimulator of T4 production in the pituitary gland.

    • B. 

      Produced in the pituitary gland.

    • C. 

      Held at a low plasma concentration by low levels of TSH.

    • D. 

      Secreted by the hypothalamus.

  • 5. 
    Which of the following statements is true?
    • A. 

      The hypothalamus primarily secrets tropic hormones that stimulate the secretion of other hormones.

    • B. 

      When plasma levels of thyroxine are low, the hypothalamus will secrete TSH and stimulate the pituitary gland to secrete more TRH.

    • C. 

      TRH travels from the hypothalamus to the thyroid gland via the hypothalamic-thyroid portal system.

    • D. 

      Both TRH and TSH are tropical fruit drinks.

  • 6. 
    Which of the following statements about metabolism is false?
    • A. 

      Catabolism refers to chemical reactions that break down large, complex molecules into smaller molecules.

    • B. 

      Energy released in metabolism can be in the form of heat.

    • C. 

      All of the energy from metabolism is ultimately stored in the chemical bonds of ATP.

    • D. 

      Anabolism refers to chemical reactions that build larger, more complex molecules.

  • 7. 
    How would you treat a thyroidectomized animal so that it functions like a "normal" animal?
    • A. 

      Provide the animal T4 supplements.

    • B. 

      Provide the animal with TSH supplements.

    • C. 

      Provide the animal iodine and tyrosine supplements.

    • D. 

      Provide the animal with TRH supplements.

  • 8. 
    As a result of the missing hormone(s) in the hypophysectimized rat, what would be some expected symptoms?
    • A. 

      High body temperature

    • B. 

      Decreased basal metabolic rate

    • C. 

      Hyperactivity

    • D. 

      Unexplained weight loss

  • 9. 
    An injection of thyroxine to an otherwise normal rat will cause which of the following?
    • A. 

      Hyperthyroidism

    • B. 

      Development of a goiter

    • C. 

      High levels of TRH secretion

    • D. 

      High levels of TSH secretion

  • 10. 
    Why didn't any of the rats develop a goiter after thyroxine injection?
    • A. 

      In all cases, negative feedback mechanisms were impaired.

    • B. 

      In all cases, TSH levels were not elevated by the thyroxine injection.

    • C. 

      In all cases, TRH levels were increased.

    • D. 

      In all cases, the thyroid gland response to TRH was lost.

  • 11. 
    Why did the normal rat develop a palpable goiter with the TSH injection?
    • A. 

      The TSH receptors on the thyroid gland were excessively stimulated.

    • B. 

      The TSH receptors in the hypothalamus were being overstimulated.

    • C. 

      The amount of T4 secretion by the thyroid gland became excessive.

    • D. 

      The TSH receptors in the hypothalamus were overstimulated.

  • 12. 
    An injection of propylthiouracil to an otherwise normal animal will cause which of the following?
    • A. 

      hyperthyroidism

    • B. 

      Excessive amounts of T4 secretion

    • C. 

      Decreased levels of TSH secretion

    • D. 

      Goiter development

  • 13. 
    Why did the normal rat develop a palpable goiter with the propylthiouracil injection?
    • A. 

      The injection decreased the negative feedback mechanism on TSH.

    • B. 

      The amount of T4 secretion by the thyroid gland became excessive.

    • C. 

      The secretion of TSH was inhibited by the drug.

    • D. 

      The secretion of TRH was impaired by the drug.