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What is equilibrium potential?
buildup of positive charge in one compartment produces an electrical potential that exactly offsets the other chemical's concentration gradient. (equal in magnitude but opposite in direction)
Which ion has biggest factor for electrical force and why?
K+. it is closer to the resting potential at 90 MV. Concentration is higher & membrane 20x more permeable to K+ than Na+
How is does the resting membrane potential convey information?
When stimulus is applied, membrane is extremely permeable to Na (more outside than in-concentration gradient)
NA rushes in
the inside of cell becomes + charge
NA/K pump is activated by (ATPase)
Action potentials strength is determined by?
Greater the strength, greater the disturbance. Depends on Na+ rushing into cell body
Membrane potential is influenced by
concentration gradient of ions
membrane permeability to those ions
AP is the
quick change in membrane permeability after threshold stimulus applied. (strong spikes over -55mv)
What happens during graded potential in a neuron?
decreemental-spread away from point of stimulus, becomes weaker as they progress
depolarization strength is proportional to stimulus
Unmyelinated are located in what NS? is it fast or slow conduction of signal?
CNS, slow because of ions move out & in has resistance
What has faster Conduction, thin or thick Axons?
Thicker and myleinated, because has less resistance
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