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Neurons that conduct impulses from afferent neurons to or toward motor neurons. They lie in the CNS.
Neurons that transmit nerve impulses away from the brain or spinal cord toward muscles or glands.
A neuron that has a single process extending from the cell body. This single process branches to form a central process and a peripheal process. These processes combine to form an axon.
A neuron found in the retina of the eye that has only one axon and one branched dendrite. Least numerous type of neuron.
A neuron that has only one axon but several dendrites. Mostly found in the brain and spinal cord.
They conduct impulses away from the cell body. They vary in length and diameter; a single process that branches.
When synaptic knobs stimulate postsynaptic neurons in rapid succession, their effects can add up to produce an action potential.
Involved in preparing the body to deal with immediate threats to the internal environment.
Part of the nervous system that carries information to the visceral effectors (smooth muscles, cardiac muscle)
What it is called when voltage gated channels in the axon membrane open because the sum of the local potentials reaches the threshold potential.
A synapse that uses a chemical transmitter to send a signal from the presynaptic cell to the postsynaptic cell.
A temporary hyperpolarization when the inside of the axon membrane is more negative than the resting potential.
Relative Refractory Period
The few milliseconds after the absolute refractory period-when the membrane is repolarizing and restoring the resting potential.
Cells that have few uses. Some lie clustered around nerve cell bodies. Some are arranged in rows between nerve fibers in the brain and spinal cord.
Glia that form thin sheets that line fluid-filled cavities in the brain and spinal cord. Some produce this fluid.
Absolute Refractory Period
When the Threshold Potential is surpassed, for about half a millisecond, the axon will not respond to any stimulus.
A structure formed from ribosomes that provide protein molecules needed for the sending of nerve signals from one neuron to another.
Small, stationary cells found in the CNS. They engulf and destroy microorganisms and cellular debris.
Star shaped cells that are the largest and most numerous type of glia. They feed neurons by using glucose and converting it to lactic acid.
A slight shift away from the resting membrane potential in a specific region of the plasma membrane.
Resting Membrane Potential
The membrane's potential maintained by a nonconducting neuron's plasma membrane.
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