What is the maximum efficiency of the heart?

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(B) The efficiency of cardiac contraction is defined as the ratio of work output to the total chemical energy expenditure. The maximum efficiency of a

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$20-25\%$

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(B) The efficiency of cardiac contraction is defined as the ratio of work output to the total chemical energy expenditure. The maximum efficiency of a healthy human heart is approximately $20-25\%$. In cases of heart failure,this efficiency can decrease significantly,potentially falling as low as $5-10\%$.

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