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What potentials are short-lived and decremental?
graded (local) potentials
A common feature of action potentials?
They are triggered by a depolarization that reaches the threshold
Graded potentials will not be initiated by?
iono
Can graded potential form on receptor endings?
Yes, Graded potentials (otherwise known as postsynaptic potentials) can form on receptor endings.
Are graded potentials the same as local potentials?
Postsynaptic potentials are changes in the membrane potential of the postsynaptic terminal of a chemical synapse. Graded potentials are changes in membrane potential that vary in size, as opposed to being all-or-none, and are not postsynaptic potentials.
How does an action potential differ from a graded potential?
Action potentials also known as spikes, differ from graded potentials in that they do not diminish in strength as they travel through the neuron.
What potentials are short-livedlocal changes in membrane potential that can be either depolarized or hyperpolarized?
Graded Potentials
What does it mean when a graded potential is called graded Why does it get this name?
Greded Is the membrane voltage change in response to a change in membrane permeability by adding or taking out gate channel. Depolarization occurs when there is a change in voltage towards a positive values b/c of opening up Na+ gate channels Hyperpolarization occurs when there is a more negative change in voltage due to opening up Cl- or K+ gate channels. It is called "graded" b/c you can open up some or many channels so the depolarization or hyperpolarization can be big or small Graded potentials start in one spot b/c of a change in permeability and then spreads to others as it travels; called local circuit current. The strength of graded potentials decreases as it spreads along the axon and eventually dies If you inject negative ions into the cell a hyperpolarization occurs If you inject positive ions into the cell a depolarization occurs If you inject a lot of positive charge the membrane depolarizes past 0 creates action potential and then comes back down' You get action potential once you pass the threshold voltage potential. Is a rapid depolarization which repolarizes
Where do graded potentials occur?
On the dendrites and subsequently the soma (body) of neurons.
What is occurring between the dendritic end and the axon hillock?
conduction and summation of graded potentials.
What are epsp?
EPSP is an abbreviation for excitatory postsynaptic potential. This is a graded depolarization of a postynaptic membrane responding to neurotransmitter stimulation.
A small deviation from the resting membrane potential that makes the membrane more or less polarized?
graded potentials
