Thyroxin (negative feedback) (Edexcel GCSE Biology Combined Science): Quizzes
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10 questions from this quiz
Which gland produces thyroxine?
Which gland produces thyroxine?
Thyroid gland
What does thyroxine control in the body?
What does thyroxine control in the body?
Metabolic rate
Where is the thyroid gland located?
Where is the thyroid gland located?
In the neck
Which structure detects low thyroxine levels?
Which structure detects low thyroxine levels?
Hypothalamus
What does the hypothalamus release when thyroxine is low?
What does the hypothalamus release when thyroxine is low?
TRH
What does TSH stimulate?
What does TSH stimulate?
The thyroid gland to produce more thyroxine
What happens when thyroxine levels return to normal?
What happens when thyroxine levels return to normal?
TRH and TSH production is inhibited
What is the purpose of the negative feedback mechanism?
What is the purpose of the negative feedback mechanism?
Maintain stable thyroxine levels
What happens to metabolic rate with an underactive thyroid?
What happens to metabolic rate with an underactive thyroid?
Metabolic rate drops
Why does an underactive thyroid cause weight gain?
Why does an underactive thyroid cause weight gain?
Less glucose broken down, stored as fat