When a nerve is cut, both the nerve and the insulation are severed. Sometimes, the fibers inside the nerve break while the insulation remains intact and healthy. If the insulation has not been cut, the end of the fiber farthest from the brain dies. The end that is closest to the brain does not die.
circuit breaker. n. 1. An automatic switch that stops the flow of electric current in a suddenly overloaded or otherwise abnormally stressed electric circuit. 2. An automatic halt or suspension in the trading on a stock exchange that takes effect in response to a specified amount of loss.
Circuit breakers can simply be reset. A circuit breaker panel is essentially a big switch made up of smaller Â­switches that correspond to certain electrical zones in a building. Should one of the switches fail, an electrician can replace it for approximately $120â$200, depending on the region.