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The human body is a complex and dynamic system that consists of approximately 37 trillion cells. These cells are grouped into different types, each with its unique structure and function. The main organs include the brain, which controls thought and movement; the heart, responsible for pumping blood throughout the body; lungs, which facilitate oxygen intake; liver, involved in detoxification and metabolism; and kidneys, crucial for filtering waste from the blood. Additionally, the human body contains a network of nerves that enable communication between different parts of the body.