Quick Answer. Voltaire wrote Candide as a satire of the then-prevalent philosophical optimism advanced by Gottfried Wilhelm Leibniz. Voltaire, moved by contemporary events like the Seven Years' War and the 1755 Lisbon earthquake, felt that optimism was a naive way of viewing the world.
Neurons carry impulses from one place to another, around the many parts of the nervous system. They connect receptors to the central nervous system and also connect one part of the nervous system to another, for example in the brain and spinal cord.
By an action potential, which is a depolarization of the nerve cell membrane, the neurolemma. A nerve impulse gets transmitted along an axon in 5 steps: 1) Stimulus opens Sodium ion (Na+) channels at Resting Potential.y a change in polarity as sodium ions enter the cell and potassium ions exit the cell, forming a wave of depolarization that travels along the axon until it reaches the axon terminal releases the neurotransmitters into the synaptic gap.