Shield

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The human body is a highly complex and intricate system that consists of approximately 37 trillion cells, each performing specific functions to maintain overall health and well-being. The heart beats at an average rate of 100,000 times per day, pumping over 2,000 gallons of blood throughout the circulatory system. The brain weighs approximately three pounds and consumes a significant amount of energy, accounting for around 20% of the body's total energy expenditure.