Contents
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.
Extra Information
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