![]() ![]() Fortunately, it turns out that the electrical activity can often be detected from the surface of the body. If a nerve fiber is exposed, one can place electrical contacts on the nerve fiber and record a nerve impulse. Scientists and doctors learned how to use the human body’s electrical activity to understand and diagnose medical problems. It is electrical impulses traveling along nerve fibers that convey sensations, such as heat, or cause muscles to contract. Animals with nervous systems use electrical impulses for sensing and responding to their environments. But electrical signaling is much, much older. Communication tools, such as the telegraph and the telephone, both invented in the 19th century, take advantage of this. Electricity is useful in sending signals, since electrical impulses can travel extremely rapidly. ![]()
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