Examples of surface tension:
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Walking on water: Small insects such as the water strider can walk on water because their weight is not enough to penetrate the surface.
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Floating a needle: A carefully placed small needle can be made to float on the surface of water even though it is several times as dense as water.
Answer:
The membrane potential is maintained in the cell due to the unequal distribution of the ions inside and outside of the cell. This membrane potential is important for the conduction of the nerve impulse.
The arrival of the stimulus triggers the action potential. The resting membrane potential is -70mV. This is maintained by the presence of potassium ions. The influx of the sodium ions result in the change in the membrane potential from -70mV to +30mV.
A sudden inrush of water could over whelm animals and possibly kill them if the water is of a different type.