Explain how ORS replaces water lost by diarrhoea.
ORS increase the uptake of sodium ions, glucose, sugars and salts into the cells, via co-transport proteins. This means the water potential in the cell lowers and therefore water moves in via osmosis.
(Toxins produced by cholera bacteria affects the transport of ions from the epithelial cells lining but has very little effect on the co-transport proteims that re-absorb ions)
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