20ml Pg 73

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The human body is a complex and intricate system that functions perfectly without our conscious awareness. It regulates its own temperature, heals itself when injured, and maintains its vital organs in optimal condition, all while we go about our daily lives with little thought to these remarkable processes. The human heart beats over 3 billion times during an average lifetime, pumping over 1.5 million barrels of blood, which is enough to fill 200 train tank cars.