Health Advice



In the End, Who's Best?

Scott LaFee on

A: A heart can "break," but even beating 100,000 times a day won't tire them out because the heart muscle isn't quite like skeletal muscles, i.e., your arms and legs. The heart is composed of cells called cardiomyocytes that are highly resistant to fatigue. They have as much as 10 times the density of mitochondria -- the internal power plants of cells -- that allow them to produce huge amounts of energy without cease.

Bonus Q: Why aren't all muscles made of cardiomyocytes?

A: Cardiomyocytes contract without a nerve supply, making them incapable of voluntary or purposeful movement. They can beat constantly without tiring, but that's it.

Last Words

"A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP." -- American actor Leonard Nimoy (1931-2015)


Technically not his last words, but his last tweet. LLAP is short for "Live long and prosper," a saying made famous by Nimoy's "Star Trek" character, Mr. Spock.


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