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15 Cards in this Set
- Front
- Back
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what are the stuctual components of the neuron
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dendrite soma and axon
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dendrite
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the cell that recieves info from other neurons
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why do anions always make the inside of the cell have more negative ions than the outside
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b.c of their size and polarity they are trapped inside the cell
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what causes the elements of the bilipid layers not to mix?
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it consists of a water repelling head and a water seeking tails which face outward and inward
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what is the reason for the sodium pump occuring?
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the bilipid layer is not totally permeable. ion chanels are the pores that the positive ions that are attracted form the outside to neg within go through.
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what is the negative number associated with the resting potential
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-70mV (more negative than the outside)
the high concentration of positive atoms out side the cell is not enough to cancel the inside |
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explain how the neurotransmitter opens the ion chanel
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binds directly to chanel protein ,channel open immediately, ions flow across membrane for a brief time
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the unequal charges of the membrain causes
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positive and negative charges to interact...
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what happens when the sodium chanels in the neuron membrane are opened
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they go into a region that is more negatively charged
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what is the amount of depolarization directly related to
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number of chanels opening and sodium ions that come through
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explain action potential
all or none |
when enough sodium ions make the -77mv to around -55.it depolarized the entire cell and can't be stopped
"all or none phenominan" |
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graded potentials
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depolorization is not reached full potential unless they're added up
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polarize
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become more negative
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hyporpolorize
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become more - then before the action potential startted
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the sodium potassium pump restores the -70 resting potential by
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excahngn 3 sodium ions for 2 potassium ions outside of the the cell
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