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Membrane Potentials

membrane potentials

QuestionAnswer
What are 3 types of membrane potentials? resting, graded, action
What is resting potential? A potential difference
Resting potential happens in ______ cells. all
what does polarized mean? there is a charge difference of -70 mv
what does depolarized mean? there is a decrease in the charge difference
Depolarization will make it _____ for an action potential to occur. easier
Hyperpolarization will make it _______ for an action potential to occur harder
different neurons have different membranes so they will respond differently to.... the stimulus being applied to them.
where does the stimulus begin in a graded potential? in the dendrocytes
what is a graded potential? it is a potential difference that diminishes as it moves forward.
what is an action potential? a self propogating wave of depolarization
the stimulus in a graded potential must be high enough to reach the? axon hillock
what happens if a stimulus reaches an axon hillock? an action potential is carried out
In a graded potential, if the stimulus does not reach the axon hillock, what will it do? it will fizzle out
what are 4 characteristics of graded potentials? occur in dendrites, short lived, localized, deminishes as it progresses
what is a generator potential? a potential that begins outside of the body and goes to the sense receptors in the dendrites
what is a presynaptic potential? a potential that is before the synapse
what is a postsynaptic potential? A potential that is after the synapse
Where does action potential occur? in axons
action potentials cover.... long distances
action potentials are the same frommm ____ to _____ beginning to end
Each action potential will be exactly the same through... the whole neuron
What happens when you increase the stimulus in an action potential? you will generate more action potentials
by increasing the intensity in an action potential, you are also increasing... frequency
What happens when you increase the intensity in a graded potential? you will have a higher stimulus so the graded potential will be longer and if it is long enough it will cause an action potential
What does EPSP stand for? excititory post synaptic potential
what does IPSP stand for? inhibitory post synaptic potential
what does EPSP do? it depolarizes a post synaptic neuron, making it more likely for an action potential to happen
what does IPSP do? hyperpolarizes a post synaptic neuron preventing the action potential from happening
post synaptic potentials are ____ summative
What is the action potential all or none phenomenon? the action potential will happen completely or it wont happen at all
What determines the speed of an action potential? the size of the fiber and degree of myelination
What type of transmission happens on myelinated neurons? saltatory
Bigger fibers will have a _____ impulse faster
smaller fibers will have a ____ impulse slower
are unmyelinated fibers or myelinated fibers faster? myelinated are faster
What are group A fibers? they have large axons and a lot of myelin
what are group B fibers? they vary in degree of myelination and in size
what are group C fibers? small axons with no myelination
A charge difference = resting potential
What is a leakage channel A passageway allowing things to fit through the cell membrane; it is not selective so things will fit through it just because they fit
What are gated channels passageways that are selective and choose what to bring in
What is a voltage channel it is a gated channel that only allows things to flow through in response to the charge on the particle
What is a chemical channel a gated channel that only allows things to flow through in response to what chemicals they are or made up of
Created by: 100000098798375
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