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Flashcards · Biology · Hormones and Reproduction

Thyroxine and Negative Feedback (Higher tier)

16 cards

  1. What does thyroxine control?

    The metabolic rate.

  2. Which gland makes thyroxine?

    The thyroid gland.

  3. What does TRH stand for?

    Thyrotropin releasing hormone.

  4. Where is TRH made?

    In the hypothalamus.

  5. What does TSH stand for?

    Thyroid stimulating hormone.

  6. Where is TSH made?

    In the pituitary gland.

  7. What does TSH act on?

    The thyroid gland.

  8. What does a low thyroxine level stimulate?

    The hypothalamus to release TRH.

  9. What does a normal thyroxine level do?

    Inhibits the release of TRH and TSH.

  10. What is negative feedback?

    A response that reverses a change, so the level stays steady.

  11. What happens to the metabolic rate if there is too little thyroxine?

    It falls.

  12. What happens to the TSH level if there is too little thyroxine?

    It is high.

  13. What element does the thyroid need?

    Iodine.

  14. What is a goitre?

    An enlarged thyroid gland.

  15. What is metabolic rate?

    The speed of the chemical reactions in the cells.

  16. Common mistake about the feedback?

    Saying that thyroxine stimulates TRH. A high level inhibits it.