Graded Potentials + Synapses Flashcards Preview

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Flashcards in Graded Potentials + Synapses Deck (28)
1

what is an AP

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

2

what is a graded pot

local change in mem pot
vary
fizzle out and nerve end

3

what is a triggering event for a grad pot

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

4

what is transduction

convert mechanical stimulus to electrical response

5

what is the trigger for AP

deep to threshold (-50mV)

6

what si the trigger for grad pot

stimulus, neurotransmitter

7

what is the ion move for AP

Na the K though voltage gated channels

8

what is the ion movement for grad pot

Net move of Na, K, Cl or Ca

9

what is the magnitude of an AP

all or none frequency

10

what is the magnitude for grad pot

she of potential changes

11

what is the duration of AP

fixed

12

what is the duration of grad pot

variable

13

what si the propagation of AP

sep regen propagation

14

what is the propagation of grad pot

decays with distance

15

are there refractory periods for AP and grad pots

AP - yes
grad pot - no

16

what is the direction of potential change for an AP

deep then hyper polarisation

17

what is the director of potential change for a grad pot

deep or hyper polarisation

18

where does AP and crd pots occur

AP - voltage gated channels
grad pots - receptors and post-synapse

19

what do grad pot receptors do

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

20

what are synapses

one way relay stations post or pure synaptic
plasticity

21

synapses ar usually chemical such as

neurotransmitters
glutamate
GABA
Ach
serotonin
Noradrenaline

22

what is EPSP

excitatory post-synaptic potential

23

what si the sequence of graded pot

gated sun potential
AP initiation
AP propagation

24

what is temporal summation

propagation from one neurons

25

what is spatial summation

propagation form multiple neurones

26

what is IPSP

inhibitory post- synaptic potential

27

what happens with IPSP

hyperpolarisation
inhibit neurotransmitter GABA

28

what is presynaptic inhibition

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