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Spinal Anatomy (Boards) > action potential > Flashcards

action potential Flashcards

1
Q

what is the resting membrane potential for a muscle

A

-85-90mv

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2
Q

what is the resting membrane potential for a neuron

A

-65-70mv

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3
Q

what is the membrane potential on the inside

A

negative

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4
Q

what is the membrane potential on the outside

A

positive

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5
Q

what makes the inside membrane potential negative

A

large proteins

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6
Q

what makes the outside membrane potential positive

A

sodium

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7
Q

what do receptors do

A

all sodium to leak into the cell, towards depolarization of nerve for action potential

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8
Q

what is deplorization

A

sodium rushing in

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9
Q

what is occurring during the ascending limb

A

sodium leaking in towards “sodium equilibrium point” from receptor stimulation

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10
Q

dorsal column receptor for vibration

A

pacinion

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11
Q

dorsal column receptor for joint position in space

A

ruffini

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12
Q

dorsal column receptors for accurate touch

A

meissners/merkels

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13
Q

what senses pain, temperature and crude touch

A

spinothalamic tracts free naked endings

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14
Q

when does threshold occur

A

enough Na+ leaks in for any portion of inner membrane to be +=
SPONTANEOUS DEPOLARIZATION

“ALL OR NOTHING PRINCIPLE”

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15
Q

what occurs during the descending limb

A

potassium moves out of cell
REPOLARIZATION

ABSOLUTE REFRACTORY PERIOD

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16
Q

what are the aka’s for subnormal period

A

hyperpolarized
relative refractory period

(more negative, harder to fire the nerve)

17
Q

what occurs during the sodium/potassium pump

A

3sodium out

2 potassium in

18
Q

minimum current for action potential

A

rheobase

19
Q

time, using 2x rheobase for action potential

A

chronaxie

20
Q

inhibitory post-synaptic potential

A

Cl-rushes in, may also open K+ channels more to leak out K+

21
Q

what is the inhibitory neurotransmitter of the spine

A

glycine

22
Q

what is the inhibitory neurotransmitter of the brain

A

GABA

Spinal Anatomy (Boards) (3 decks)

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