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Resting membrane potential
Difference in electrical charge across the plasma membrane. The membrane would be POLARIZED.
Sodium Potassium Pumps
How does the membrane maintain the difference in electrical charge established by diffusion of ions?
The amt of stimulus needed to create an action potential. NA+ rushes into the cell increasing the number of positive ions inside the cell and changing the membrane polarity
The interior surface fo the membrane becomes less negative and the exterior surface becomes less positive
K+ moves out of the cell causing the membrane potential to move in a negative direction.
The membrane has become more negative than resting potential. Until the channels close.
Absolute Refractory Period
What period is it when the sodium ion channels are open, the membrane is totally insensitive to additional stimuli, regardless of the force of the stimulus?
Relative Refractory period
What period is it during repolarization, the membrane may be stimulated if a very strong stimulus is used?
What toxin blocks synaptic transmission by preventing the flow of neural impulses from neuron to neuron?
What is the name of the velocity of the action potential along a neural membrane?
larger the nerve the faster the conduction velocity, myelinated nerves are faster than unmyelinated nerves
What is the relationship between myelination and size and conduction velocity?
Form the supportive framework for the nervous tissue; contact and stimulate blood capillaries; convert blood glucose; secret proteins; regulate chemical composition of tissue fluid
Line cavities of the brain and spinal cord; secrete and circulate cerebrospinal fluid
a neuron that conducts impulses away form the CNS to muscles and glands; motor neurons
neuron serving as part of the conduction pathway between sensory and motor neurons; association neurons
a chemical released at the distal end of an axon that stimulates an adjacent cell; found in the synaptic vesicles of the axon terminal; initiates electrical current from one neuron to the next by diffusing across the synaptic cleft
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