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betweentourns t1_j66swd4 wrote

> your heart and lungs also have to work harder



BurnOutBrighter6 t1_j67doau wrote

Living tissue (including fat cells) need a constant supply of blood and oxygen. The bigger you are, there's just physically more flesh to keep supplied. Your heart has to push a bigger volume of blood through a longer length of tubes to reach all the parts.

It's like how if a city could only have one water-supply pump station, and could only use one diameter of pipe, as the city got bigger and added hundreds of houses further and further away, that pump would have to run more often and at higher pressure to keep up with the flow being drawn from everyone's taps.


Anerky t1_j67bajp wrote

There is also fat and plaque buildup on your blood vessels over time which makes the same if not more blood have to move through tighter vessels