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Why Your Heart Deserves a Hand
Every muscle in the body gets to rest sometimes, but not the heart.
By Dr. Sanjay Gupta
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Give a tennis ball a good hard squeeze. Now do it again…and again. After 100,000 squeezes, you’ve done the equivalent of one day’s work for a human heart. And your heart does that every day, without rest, for your entire life.
Even when you’re lying in bed, your heart is working harder than your legs when you’re running at full speed. That’s because this muscle must pump six quarts of blood through your body every 20 seconds.
It’s a long journey: from the aorta, as wide as a garden hose, to the capillaries that reach every cell of the body, so tiny the blood cells must squeeze through single file.
If all the blood vessels in your body were lined up, they would circle the globe four times.
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