Vertebrae

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The human body is a complex and intricate machine that is capable of performing a wide range of functions without any conscious thought or effort on its part. It can walk, run, jump, and even think, all without needing to be told how to do so. This is because the human brain is able to send out signals to the various parts of the body, telling them what to do and when to do it. These signals are sent through a network of nerve cells that crisscross the entire body, allowing for communication between different parts of the machine.