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The human body is a complex system made up of many different parts. It is estimated that there are over 60 trillion cells in the average adult human body. These cells work together to perform various functions such as movement, digestion, and regulation of body temperature. The human brain, which weighs approximately 1.4 kg, plays a crucial role in controlling all bodily functions. It sends signals to muscles through the nervous system, allowing us to move and respond to stimuli.