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Hormone

Key Stage 4

Meaning

A hormone is a chemical messenger used to send signals around the body to target organs via the blood stream.

About Hormones

Hormones are used in the coordination of the body.
Hormones are secreted by endocrine glands.
Different hormones affect the behaviour of different target organs.
Hormones travel around the body through the blood.
Hormones can last a long time in the blood before being removed so the behaviour of a target organ may be changed for some time.

Hormones compared to Electrical Impulses

Hormones travel around the body in the blood stream while electrical impulses travel via the nerves.
Hormones take longer to travel around the body than electrical impulses.
The effect of hormones can be persistent while the elecrtrical impulses are instantaneous.

References

AQA

Hormone, pages 116, 131, 171, 172-3, 190-1, GCSE Biology; Student Book, Collins, AQA
Hormone; ACTH, page 191, GCSE Biology; Student Book, Collins, AQA
Hormone; ADH, pages 200-1, 215, GCSE Biology; Student Book, Collins, AQA
Hormone; Adrenaline, pages 190, 202-3, 214-5, GCSE Biology; Student Book, Collins, AQA
Hormones, page 132, GCSE Biology, Hodder, AQA
Hormones, page 23, GCSE Combined Science Trilogy 1, Hodder, AQA
Hormones, page 61, GCSE Combined Science; The Revision Guide, CGP, AQA
Hormones, page 73, GCSE Biology; The Revision Guide, CGP, AQA
Hormones, pages 148, 152, 160-181, GCSE Biology; Third Edition, Oxford University Press, AQA
Hormones, pages 181, 182, GCSE Combined Science Trilogy; Biology, CGP, AQA
Hormones, pages 2, 11, 12-13, GCSE Combined Science Trilogy 2, Hodder, AQA
Hormones, pages 207, 208, GCSE Biology, CGP, AQA

Edexcel

Hormones, pages 142-143, GCSE Biology, Pearson, Edexcel
Hormones, pages 224-234, 238, 239, 248, GCSE Biology, CGP, Edexcel
Hormones, pages 52-56, GCSE Combined Science; The Revision Guide, CGP, Edexcel
Hormones, pages 77-81, GCSE Biology; The Revision Guide, CGP, Edexcel
Hormones, pages 98-99, GCSE Combined Science, Pearson Edexcel
Hormones, plants, pages 136-137, GCSE Biology, Pearson, Edexcel
Hormones, plants; uses, pages 138-139, GCSE Biology, Pearson, Edexcel
Hormones; blood glucose, pages 106-107, GCSE Combined Science, Pearson Edexcel
Hormones; blood glucose, pages 150-151, GCSE Biology, Pearson, Edexcel
Hormones; menstrual cycle, pages 104-105, GCSE Combined Science, Pearson Edexcel
Hormones; menstrual cycle, pages 148-149, GCSE Biology, Pearson, Edexcel
Hormones; plant hormones, pages 215-219, GCSE Biology, CGP, Edexcel

OCR

Hormones, page 46, Gateway GCSE Biology; The Revision Guide, CGP, OCR
Hormones, pages 37-40, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
Hormones; endocrine system, pages 100-101, Gateway GCSE Biology, Oxford, OCR
Hormones; fertility treatment, pages 108-109, Gateway GCSE Biology, Oxford, OCR
Hormones; menstrual cycle, page 104, Gateway GCSE Biology, Oxford, OCR
Hormones; plants, pages 110-113, Gateway GCSE Biology, Oxford, OCR
Hormones; pregnancy, page 225, Gateway GCSE Biology, Oxford, OCR

Extra Information