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PSY1048 Intra > Cours 4 > Flashcards

Cours 4 Flashcards

1
Q

Seuil

A

Potentiel membranaire nécessaire ->

Na+ > K+

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2
Q

Phase ascendante

A

Potentiel interne négatif ->
Na+ -> dépolarisation

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3
Q

Dépassement (overshoot)

A

Potentiel = 40 mV

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4
Q

Phase descendante

A

Canaux Na+ fermés -> canaux K+ ouverts

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5
Q

Période réfractaire absolue

A

Dépolarisation = canaux Na+ inactifs

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6
Q

Hyperpolarisation (undershoot)

A

Retour au potentiel de repos.

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7
Q

Propagation orthodromique

A

Soma vers boutons terminaux

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8
Q

Propagation antidromique

A

Boutons terminauxs vers soma

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9
Q

Axodendritique

A

Connection axone -> dendrite

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10
Q

Axosomatique

A

Connection axone -> soma

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11
Q

Axoaxonique

A

Connection axone -> axone -> soma

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12
Q

Types de neurotransmetteurs

A

Acide aminés, amines, peptides

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13
Q

Catégories de récepteurs

A

Ionotropique et métabotropique

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14
Q

Potentiel post-synaptique excitateur (PPSE)

A

Récepteur -> Na+ = dépolarisation

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15
Q

Potentiel post-synaptique inhibiteur (PPSI)

A

Récepteurs -> Cl- = hyperpolarisation

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16
Q

Autorécepteurs

A

Avec protéine G -> production de second messagers

17
Q

Recyclage

A

Élimination -> neurotransmetteur -> rendre possible nouvelle communication

Peut se faire par diffusion passive

18
Q

Mécanisme agoniste

A

Augmente transmission

19
Q

Mécanisme antagoniste

A

Diminue transmission

20
Q

Systèmes modulateurs diffus du cerveau

A

Transmet messages par neurones (SNC)

21
Q

Systèmes modulateurs diffus ont en commun…

A

Associé -> neurotransmetteur
Petit ensemble de neurones
Dans tronc cérébral

22
Q

4 principaux systèmes modulateurs

A

Sérotonine
ACh
Dopamine
NA

23
Q

Inhibiteurs sélectifs de la recapture de la sérotonine (ISRS)

A

Prolongent action -> sérotonine -> réduisent sa recapture

24
Q

Noyau accumbens

A

Héroïne, nicotine, cocaïne le stimulent

PSY1048 Intra (4 decks)

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