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Without you noticing, your heart works every second of your life. On average, it beats around 100,000 times each day and pumps thousands of liters of blood throughout your body. It continues working while you sleep, exercise, and even when you're completely relaxed. Over an average lifetime, the human heart beats more than 2.5 billion times.
Few machines could operate continuously for that long without stopping. Your heart is one of the most reliable organs in the human body.
© American Heart Association