Wednesday, December 5, 2007

How do nerves work?
Most nerves cells have a long thread, called an axon, which works partly like a battery and partly like a wire. When the nerves is resting, the axon is charged with electricity, just like the terminals of a battery. When the nerves is triggered into action, the charge suddenly changes, creating a signal that flashed down the axon. The nerves that the signals pass along to tell muscles to contract are called 'motor nerves. The nerves that carry messages from sense organs to your brain are called 'sensory' nerves. Signals travel along nerves at about 360 km/h (225 mph), fast enough to travel from your brain to your toes in less than 1/50 of a second.

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