Hormonal System
- Created by: Molly Webb
- Created on: 16-02-16 12:42
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- Hormonal System
- Sends information as chemical signals
- Made up of endocrine glands and hormones
- Endocrine glands
- Group of cells specialised to secrete hormones
- E.G. Pancreas secretes insulin
- Group of cells specialised to secrete hormones
- Hormones
- Chemical messengers
- E.G. Proteins or peptides or steroids
- Secreted when an endocrine gland is stimulated
- By a change in concentration of a specific substance or by electrical impulses
- Diffuse directly into the blood and transported by circulatory system
- Only bind to specific receptors for that hormone
- Known as target cells
- Only bind to specific receptors for that hormone
- Chemical messengers
- Endocrine glands
- Hormone = first messenger
- It carries the chemical message from endocrine gland to receptor on target cells
- Enzyme catalyses production of the signalling molecule in the cell
- The signalling molecule signals to other parts of the cell to change
- Second messengers activate a cascade (chain of reactions) in the cell
- The signalling molecule signals to other parts of the cell to change
- Enzyme catalyses production of the signalling molecule in the cell
- It carries the chemical message from endocrine gland to receptor on target cells
- EXAMPLE
- EXAMPLE
- Exocrine glands secrete chemicals through ducts into cavities or onto surface of body
- Usually enzymes
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