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.
1 An electrical impulse travels along an axon. 2  This triggers the nerve-ending of a neuron to release chemical messengers called neurotransmitters. 3  These chemicals diffuse across the synapse (the gap) and bind with receptor molecules on the membrane of the next neuron.he chemical diffuses across the gap makes the next neurone transmit an electrical signal. 1  An electrical impulse travels along an axon. 2  This triggers the nerve-ending of a neuron to release chemical messengers called neurotransmitters.