Posted by brandon on Thursday, October 27, 2011 at 5:09pm.
if blood entering the heart gets mixed with blood leaving the heart the blood leaving the heart will get poluted. the blood entering the heart is poluted when it enters the heart, the heart cleans it up; so when the blood leaves the heart it is clean so if it gets polluted the person may get sick and this leads to his/her death.
(Google)
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