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The human body is a complex and highly adaptable system that has evolved over millions of years to perform a wide range of functions necessary for survival. The human brain, which weighs approximately 1.4 kilograms, is responsible for controlling the entire body, processing information, and enabling communication with others. It consists of billions of interconnected neurons, or nerve cells, that transmit electrical signals at speeds of up to 200 miles per hour. These signals are then converted into chemical messages, known as neurotransmitters, which travel across synapses, or gaps between neurons, to convey information throughout the body. The human heart is another vital organ, pumping approximately 2,000 gallons of blood through its chambers every day. It beats around 3 billion times in a person's lifetime, generating enough force to reach speeds of up to 60 miles per hour. The lungs, responsible for exchanging oxygen and carbon dioxide through respiration, take in approximately 20,000 breaths daily. The human skin, which weighs about six pounds and covers an area of around 22 square feet, protects the body from external damage while also regulating temperature and facilitating sensations such as touch and pressure.