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>>> Mass rises as the cube of size, but muscle power rises as the square of
>>> size.
>>
>> I would have thought the strength of a muscle depends on its volume, why
>> do you say is rises with the square of size?
>
> Muscle power is [apparently] proportional to cross-section area, not
> volume.
I guess that makes sense if you assume each cell in the muscle fibre can
only exert a certain force, a chain of them can still only exert that same
force no matter how long it is. It's having more fibres in parallel that
help to increase the force.
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