1. Need to make sure that the water around the outside of the cell does not become too concentrated or not concentrated enough
2. it needs to be kept isotonic
3. The cell would not be stable if its hypertonic or hypotonic because the water would go into or out of the cell.
4. This is achieved by controlling the concentration of the blood.
5. The kidneys must control the composition
- Keeping an equal salt and water ratio
- this is done through osmoregulation
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