Giving those suffering from cholera water is ineffective for two reasons:
- Water is not being absorbed from the intestines. Its remaining in there and passing out in diarrhoea
- Water does not replace the lost electrolytes/ions
In order for the ORT to work, it must use alternative protein carrier in the cell-surface membranes of the epithelial cells. As the sodium ions are absorbed, the WP of the cells will fall; causing water to be absorbed via osmosis.
The ORS needs to contain:
- Water: to rehydrate the tissues
- Glucose: provide a source of energy + stimulate the uptake of sodium ions
- Sodium: make optimum use of the sodium-glucose carrier proteins + replace the lost sodium ions
- Potassium: stimulate appetite + replace lost potassium ions
- Other electrolytes: prevent electrolyte imbalances
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