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Neuroanatomy > Graded Potentials + Synapses > Flashcards

Graded Potentials + Synapses Flashcards

1
Q

what is an AP

A

all or none event
profile of voltage change and fixed time
propagates along axon
positive feedback

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2
Q

what is a graded pot

A

local change in mem pot
vary
fizzle out and nerve end

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3
Q

what is a triggering event for a grad pot

A

synaptic - post syn mem
receptor - action of stimulus
mech, them thermal gated channel

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4
Q

what is transduction

A

convert mechanical stimulus to electrical response

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5
Q

what is the trigger for AP

A

deep to threshold (-50mV)

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6
Q

what si the trigger for grad pot

A

stimulus, neurotransmitter

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7
Q

what is the ion move for AP

A

Na the K though voltage gated channels

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8
Q

what is the ion movement for grad pot

A

Net move of Na, K, Cl or Ca

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9
Q

what is the magnitude of an AP

A

all or none frequency

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10
Q

what is the magnitude for grad pot

A

she of potential changes

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11
Q

what is the duration of AP

A

fixed

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12
Q

what is the duration of grad pot

A

variable

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13
Q

what si the propagation of AP

A

sep regen propagation

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14
Q

what is the propagation of grad pot

A

decays with distance

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15
Q

are there refractory periods for AP and grad pots

A

AP - yes

grad pot - no

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16
Q

what is the direction of potential change for an AP

A

deep then hyper polarisation

17
Q

what is the director of potential change for a grad pot

A

deep or hyper polarisation

18
Q

where does AP and crd pots occur

A

AP - voltage gated channels

grad pots - receptors and post-synapse

19
Q

what do grad pot receptors do

A 
transduction at nerve ends
via channels (mechanical, thermal, capsaicin- spice)
20
Q

what are synapses

A

one way relay stations post or pure synaptic

plasticity

21
Q

synapses ar usually chemical such as

A 
neurotransmitters
glutamate 
GABA
Ach
serotonin 
Noradrenaline
22
Q

what is EPSP

A

excitatory post-synaptic potential

23
Q

what si the sequence of graded pot

A

gated sun potential
AP initiation
AP propagation

24
Q

what is temporal summation

A

propagation from one neurons

25
Q

what is spatial summation

A

propagation form multiple neurones

26
Q

what is IPSP

A

inhibitory post- synaptic potential

27
Q

what happens with IPSP

A

hyperpolarisation

inhibit neurotransmitter GABA

28
Q

what is presynaptic inhibition

A

no direct effect on post synaptic mem
decrease neurotransmitter release
axo-axonal synapse

Neuroanatomy (20 decks)

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