Edexcel GCSE Combined Science · 1SC0
Paper 1, Paper 2
Revise: Hormones and Metabolic RateLow thyroxine stimulates the hypothalamus to produce TRH.
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GCSE Combined Science · key term
Thyrotropin-releasing hormone: a hormone produced by the hypothalamus that stimulates the pituitary gland to release TSH.
Used by Edexcel
Paper 1, Paper 2
Revise: Hormones and Metabolic RateLow thyroxine stimulates the hypothalamus to produce TRH.
Keep the thyroxine control sequence clear: hypothalamus → TRH → pituitary → TSH → thyroid → thyroxine. Explain how normal thyroxine levels inhibit the earlier stages.
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