Examlex
What structure is primarily responsible for focusing light onto the back of the eye?
Myelin
Fatty material produced by neuroglial cells; insulates axons and thus speeds conduction of action potentials.
Neuroglial Cells
Supportive cells in the nervous system that provide insulation, nutrients, and structural support for neurons, and participate in signal transmission.
Myelin
A fatty covering that insulates nerve fibers in the brain, spinal cord, and peripheral nerves, speeding the transmission of nerve impulses.
Action Potential
A rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane, a process allowing neurons to transmit signals.
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