AQA GCSE Combined Science Trilogy · 8464
Specification 4.5.3.6 · Paper 2
Revise: Feedback SystemsAdrenaline prepares the body to react to a threat, whereas thyroxine helps regulate the body's everyday chemical activity.
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GCSE Combined Science · key term
A hormone released by the thyroid gland that stimulates basal metabolic rate and supports growth and development.
Used by AQA and Edexcel
Specification 4.5.3.6 · Paper 2
Revise: Feedback SystemsAdrenaline prepares the body to react to a threat, whereas thyroxine helps regulate the body's everyday chemical activity.
Paper 1, Paper 2
A hormone produced by the thyroid gland that controls the body's metabolic rate.
Revise: Hormones and Metabolic RateFor example, TSH travels from the pituitary gland to the thyroid gland and stimulates it to produce thyroxine.
For negative feedback, state the initial change and explain how the response opposes it. Cover both high and low thyroxine levels when asked.
Distinguish the glands: adrenal glands release adrenaline; the thyroid gland releases thyroxine; the pituitary gland releases TSH.
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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