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The Nerve Impulse

The nerve impulse, what causes it

QuestionAnswer
The changes associated with the action potential, or nerve impulse, are caused by the movement of specific WHAT across the cell membrane of the neuron. Ions
The chief intracellular cation is what? Potassium K+
If the axonal membrane is or becomes permeable to K+ it diffuses WHAT? Outwardly
The chief extracellular cation is is WHAT? Sodium Na+
If the axonal membrane is permeable to Na+, it diffuses WHAT? Inwardly
The flow of ions is dependent on two factors: the concentration gradients of WHAT and WHAT and the permeability characteristics of the membrane. Potassium K+ and Sodium Na+
The resting state of the WHAT is the result of the number and types of ions (both positive (cations) and negative (anions) located inside the WHAT? Neuron
In the resting state of the neuron, some of the WHAT ions leak out of the cell, taking with them the positive charge. K+
In the resting state of the neuron, when some of the K+ ions leak out of the cell, the lost positive charge and the excess anions (negative) trapped in the cell make the inside of the cell WHAT? negative
It is the outward leak of WHAT that is responsible for the resting membrane potential. K+
When the neuron is stimulated, the permeability of the neuronal membrane changes allowing WHAT to diffuse rapidly across the membrane into the cell, carrying with it a positive charge. Sodium ions (Na+)
The rapid inward diffusion of WHAT causes depolarization. Na+
In repolarization WHAT is rapidly diffused out of the cell? K+
The outward rapid diffusion/movement of K+ out of the cell causes repolarization and a return to the WHAT? Resting state
To convey information, a nerve impulse (action potential) must move the length of the WHAT, from the cell body to the axon terminal. Neuron
Because of the ability of each nerve impulse to depolarize the adjacent membrane, the nerve impulse moves toward the axon terminal much like a WHAT? Wave
WHAT increases the movement of the nerve impulse along the axonal membrane? Myelination
At the nodes of Ranvier, the axonal membrane is bare or WHAT? Unmyelinated
In a myelinated fiber, the nerve impulse jumps from WHAT to WHAT, much like a kangaroo to the end of the axon. node to node
Myelinated fibers are considered fast conducting nerve fibers. T or F True
The nerve impulse travels the length of the axon. However, the signal does not jump from one neuro to the next. A WHAT helps information move chemically from one neuron to the next. Synapse
Created by: JoJo500%
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