Answer
The heart pumps between 0.070L and 0.230L per beat.
Work Step by Step
$70mL\times\frac{1L}{1000mL}=\frac{70}{1000}mL=0.070mL$
$230mL\times\frac{1L}{1000mL}=\frac{230}{1000}mL=0.230mL$
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