Why Doesn’t the Heart Get Tired and Need to Rest Like Other Muscles?

Mindy N. asks: After a long run my leg muscles are tired, but my heart is not. Why doesn’t the heart need any rest? An average of around 60 to 100 times every minute of every day of every year of your ultimately meaningless life, your heart beats… until it doesn’t. Not long after it stops, all knowledge of your […]
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