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heat will be absorbed and the products will be formed faster exothermic reaction will undergo spontaneously as it does not require any energy while endothermic reaction has to be supplied with energy to happen therefore exothermic reaction will be faster than endothermic reaction
This rapid rate of conduction is called saltatory conduction. The presence of a myelin sheath therefore both speeds up the conduction process and reduces the amount of energy used. The faster conducting axons have the thickest myelin sheath and the longest internodes. Not all axons are covered with myelin. The speed that a nerve impulse travels along an axon is also proportional to the internodal length and since this is proportional to the diameter of an axon, the larger the diameter of the latter the faster the speed of conduction.