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Walter Cannon (1871-1945)

In 1929 he coined the term "homeostasis" and described 4 postulates that are methods of maintaining it.

1. Role of nervous system in preserving the "fitness" of the internal environment.

2. Tonic level of activity

3. Antagonistic controls for same parameters

4. chemical signals have different effects on different tissues

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Q: What are cannon's postulates?
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