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Samenvatting The Student's Guide to Cognitive Neuroscience H 2

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Samenvatting van The Student's Guide to Cognitive Neuroscience hoofdstuk 2 van Jamie Ward. Alle belangrijke informatie en begrippen in een overzichtelijke samenvatting.

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The Student’s Guide to Cognitive
Neuroscience
HOOFDSTUK 2
Neuron
- cellichaam
- dendriet ontvangt info (veel)
- axon verstuurt info (enkel)

Synaps spleet tussen het pre- en postsynaptische neuron, waar
communicatie plaats vindt d.m.v. een actiepotentiaal
Neurotransmitters chemische stoffen, die over via de synaps signalen
overdragen, kunnen inhiberend of exciterend zijn
(0) Over het membraan van een neuron staat een restspanning van -70 mV
(binnen -) door [Na+] en [K+]. (1) Door een elektriciteitsgolf, die groot genoeg is,
(2) gaan de Na-poorten in het membraan open. Na + stroomt de neuron in, die
depolariseert tot -50mV. Het membraan wordt permeabel en schiet tot boven 0
mV: deze piek heet het actiepotentiaal. (3) Na-poorten sluiten en K wordt de
neuron uitgepompt, waardoor het negatieve rustpotentiaal groeit. (4) De neuron
is kort gehyperpolariseerd, waardoor het signaal niet terug kan.
Myeline geleidende stof rond een axon, leidt tot saltotaire geleiding van
signalen (knopen van Ranvier)
Neuronen coderen info d.m.v. de frequentie van actiepotentialen.

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H 2
Uploaded on
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Number of pages
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Written in
2019/2020
Type
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