Thyroxin (negative feedback) (Edexcel GCSE Biology): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 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
What is metabolic rate?
What is metabolic rate?
Speed chemical reactions occur in body
Which organ detects low thyroxine levels?
Which organ detects low thyroxine levels?
Hypothalamus
What hormone does the hypothalamus release when thyroxine is low?
What hormone does the hypothalamus release when thyroxine is low?
TRH
What does TRH do?
What does TRH do?
Signals pituitary gland to release TSH
Which gland releases TSH?
Which gland releases TSH?
Pituitary gland
What does TSH stimulate?
What does TSH stimulate?
Thyroid gland to produce thyroxine
Where is the thyroid gland located?
Where is the thyroid gland located?
In the neck
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 negative feedback for thyroxine?
What is the purpose of negative feedback for thyroxine?
Maintain stable thyroxine levels
Why does an underactive thyroid gland cause weight gain?
Why does an underactive thyroid gland cause weight gain?
Less thyroxine so metabolic rate drops