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When Zener diode is used as a voltage regulator, what happens to the extra voltage and current? Where does it go?

As per my knowledge we should use low voltage and current, if there is increase in voltage ,the current flowing it through also increases,this reverse saturation current remains fairly constant over a wide range of reverse voltages.​A semiconductor diode blocks current in the reverse direction,as we know that zener diode is reverse bias ,but it will suffer from premature breakdown or damage if the reverse voltage applied across becomes high.

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ok we can take a eg. now if water is flowing through a tap so u can adjust the water coming out of the tap the zener does the same . as water in the tap remains inside the pipe itself, so the current remains inside the conductor
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The unregulated dc voltage is connected to the zener diode through a series resistance Rs  such that zener diode is reverse biased.if input voltage increases, the current through Rs and zener diode also increases.also voltage in Rs increases but voltage in zener diode remains constant.thus zener diode act as a voltage regulator. 
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If extra current or voltage is used zener diode get damaged .
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