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.
Transmit electrical impulses, basic unit of nervous system. Carry impulses from brain and spinal cord to muscles and glands. Motor neuron receives impulse from the interneuron. It carries the impulse to the effector and releases a chemical that causes a muscle to contract/a gland to secrete. Sensory neurons Carry impulses from the sense organs to the spinal cord and brain.