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the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from an electrically insulating substance called myelin and helps to increase the speed by which nerve impulses travel along the nerve.
the structural and functional unit of the kidney, which filters the blood and produces urine....
the neurons that link motor and sensory neurons within the central nervous system.
the active maintenance of the correct balance of water and solutes in the blood and tissue fluid...