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No, cnidarians such as hydra don't have a centralized nervous system, theirs is rather diffuse. They have neither brain nor ganglia.
Yes.
No, a nerve is one part of an organ system--the nervous system.
A motor nerve is part of the nervous system that moves muscles.
Synapses are the part of the nervous system that coordinates the passage of nerve impulses. They are the junctions between neurons.
A motor nerve is part of the nervous system that moves muscles.
PNS means peripheral nervous system. CNS means central nervous system.
A nerve cell is part of the nervous system, a network of neurons that carry signals throughout the body.
Optic nerve
A motor nerve is part of the nervous system that moves muscles.
Well that depends. If you are referring to the eye on a whole, then the answer is no, the eye is considered part of the optical system. But if you mean "is any part of the eye consider to be part of the nervous system?", then the answer is yes, the optical nerve situated at the back of the retina, is part of the nervous system
No. A nerve is made up of neuron cells, and is part of the nervous system. A gemete is a different sort of cell, such as a sperm or egg, that is part of the reproductive system.