action potential Flashcards

1
Q

what is action potential

A

signal being send down a neuron

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2
Q
  1. step
A

2 k+ move into cell
3 na+ move outside cell
establishes restimg membrane -70mV

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3
Q
  1. step
A

positive signal from brain increases charge of cell to -55mV
when -55 is reached na+ channels open and na+ ions flood into cell

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4
Q
  1. step
A

inside of cell switches polarity to +35 caused to open na+ channels
na+ channels close
k+ channels open

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5
Q
  1. step
A

rush of k+ outside cell
returns voltage to negative
at -15 k+ channels close

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6
Q
  1. step
A

positive signal reaches axon terminal
neurotransmitter is released and crossed post synaptic cleft

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7
Q

hyperpolorication

A

-70 - -90

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8
Q

desting potential

A

-70 before it jumps

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9
Q

repolarization

A

+35 till -55

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10
Q

depolarization

A

-55 till +35

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11
Q

k+

A

potassium

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12
Q

na+

A

sodium

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