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Thyroid-stimulating hormone (TSH) — OCR GCSE Combined Science B Definition

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Combined Science
Key terms
Thyroid-stimulating hormone (TSH)

GCSE Combined Science · key term

Thyroid-stimulating hormone (TSH)

Definition

A hormone released by the pituitary gland that stimulates the thyroid gland to release thyroxine.

Used by OCR

How each exam board covers it

OCR GCSE Combined Science B · J260

Biology, Combined Science

Thyroxine secretion is controlled by thyroid-stimulating hormone, usually shortened to TSH. The pituitary gland releases TSH, which stimulates the thyroid gland to release thyroxine. The amount of TSH released changes according to the level of thyroxine in the blood.
Revise: Endocrine System Principles

OCR Combined Science B past papers

Exam tips

1
Explain negative feedback in both directions: low thyroxine increases TSH release; high thyroxine reduces TSH release.

Related key terms

Adrenaline
Basal metabolic rate
Endocrine system
Hormone
Negative feedback

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