On 21-7-2010 22:23, Darren New wrote:
> andrel wrote:
>> I think it is more like that you need to move more mass, 
> 
> I've read that the natural lifespans of mammals is surprisingly close to 
> the same number of heartbeats for all of them.
> 
Yes (most, some exceptions) and a surface ECG is almost the same size in 
every mammal (around 1mV) and breathing scales with size at about 5-10 
beats per breath in rest...

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