Question

our heart works____ as hard as a muscle of a sprinter

Answer 1

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Question :: our heart works____ as hard as a muscle of a sprinter

ANSWER::

Our heart works twice as hard as a muscle of a sprinter.

Extra Information - Let's make above sentence a little bit more meaningful.

Muscles of the heart work hard-twice as hard as the leg muscles of a person sprinting.

An athlete’s heart churns almost eight gallons of blood per minute.

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