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SCIENCE WATCH
When it comes to sending electrical nerve signals, some messages are more urgent than others. Our muscles need to be activated quickly when we are attacked, for instance, while our receptors for chronic pain do not require such a rapid response. To meet these various delivery requirements, nerve fibres differ considerably in the way they transmit and fire signals.
During the 1920s Joseph Erlanger and his student Herbert Gasser studied the properties and distribution of nerve fibres. They showed that thicker fibres convey nerve impulses faster and were awarded the Nobel Prize in Physiology or Medicine 1944 for their work.
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