In the same note, why wouldn’t the entire body being made of such “unresting” tissues be a good idea? Wouldn’t it improve survival to have a small period of vulnerability?
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Because the heart is special. It’s literally made of a different kind of muscle than any other in your body, called “cardiac muscle”. It doesn’t need rest because heart muscles have 10x the amount of energy generators (mitochondria) that other muscles have.
Why don’t other muscles have all that mitochondria? Well think of how many people throughout humanity have died of starvation. Now think how many more would starve if *every* muscle needed 10x more energy than it currently does.
The heart can work all the time because it’s the only heart. If everything was as energy intensive as the heart, we wouldn’t have made it this far.
Life is a game of tradeoffs. Yeah, some things would be great to have way more of, but they’re just too energy inefficient to make more use of.
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