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GCSE Combined Science · key term
A chemical messenger secreted by a gland into the blood and carried to target cells or organs, where it produces a response.
Used by AQA and Edexcel
Specification 4.5.3.1, 4.5.3.6 · Paper 2
A chemical messenger carried in the blood to a target organ, where it produces an effect.
Revise: Human Endocrine SystemThe endocrine system helps achieve this using chemical messages called hormones. Hormones help control processes such as growth, reproduction and blood glucose regulation.
A chemical messenger released by a gland and carried in the blood to affect target organs or cells.
When describing hormonal coordination, give the complete route: endocrine gland → hormone released into the blood → target organ → effect.
Explain why the pituitary is called a ‘master gland’: it releases hormones that stimulate other endocrine glands to release hormones.
For hormone transport, state that an endocrine gland releases the hormone into the bloodstream, which carries it to its target organ.
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Paper 1, Paper 2
A chemical messenger produced by an endocrine gland and carried in the blood to alter the activity of specific target cells or organs.
Revise: Hormones and Metabolic RateOne way they communicate is through hormones: chemical messengers produced by endocrine glands. A gland is a group of cells that produces and releases a substance. Endocrine glands release their hormones directly into the bloodstream.