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When you press the balloon on the heart pump model the water come's out and in the human heart,the heart  is just like squeezing/pumping and the oxygenated blood go through the ateries andcirculate throughout our body.
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A Mechanical Pump Can and will actually/ Eventually Wear out by time....  because nothing mechanical last for so long....

as for a natural human heart..... it can last for even more than a century if we just take good foods that is healthy for our heart and body...
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