Sherpa

Existing user?

Combined Science: Biology

GCSE · Edexcel · higher

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  6
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  8
- Cardiovascular Disease
  6

The Organism in the Environment
Human Influences on the Environment
- Human Impact on Biodiversity
  6
- Benefits of Maintaining Biodiversity
  6
Cycles within Ecosystems

Thyroxine Flashcards

All 5 cards in this deck

Which gland produces thyroxine, and what does thyroxine control?: The thyroid gland; thyroxine increases the metabolic rate.
What happens to TRH and TSH when thyroxine levels return to normal?: Thyroxine inhibits the release of TRH and the production of TSH, so less thyroxine is made.
What is metabolic rate?: How fast all the chemical reactions going on in the body's cells happen.
What does the hypothalamus release when the blood thyroxine level falls below normal?: TRH (thyrotropin-releasing hormone).
What does TSH do in the control of thyroxine levels?: TSH (thyroid-stimulating hormone) is released by the pituitary gland in response to TRH; it stimulates the thyroid gland to release thyroxine, so the level rises back to normal.