The body loses heat quickly in cold water. A researcher investigated the effect of length of time ina bath of ice-cold water on the reaction times of 20 healthy people aged between 21 and 23years of age.She measured each person's reaction time after being left in ice-cold water for 15, 30 or 45seconds. She also recorded each person's reaction time before being placed in the ice-coldwater (0 seconds).The table shows her results.One reason that reaction time is slower when body temperature falls is becausenerve impulse conduction is slower. Explain how a lower temperature leads to slowernerve impulse conduction.

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