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The human body is a complex and intricate machine that operates on various levels simultaneously. The nervous system, which is responsible for sending signals from one part of the body to another, is made up of billions of neurons that work together to process information and control movement. Neurons are highly specialized cells that communicate with each other through electrical and chemical signals. They have long extensions called axons and dendrites that allow them to transmit and receive information from other neurons. The synapses, which are the connections between neurons, play a crucial role in controlling how information is transmitted. The human brain is a massive organ that weighs approximately three pounds and contains over 100 billion neurons. It consumes around 20% of the body's energy expenditure while accounting for only about 2% of its mass. The brain's primary function is to process sensory information from various sources, including our senses, memories, and emotions. The human body has a unique ability to heal itself, which is made possible by the presence of stem cells in every tissue. These cells have the capacity to differentiate into different cell types, allowing them to repair damaged tissues and restore normal function.