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Le synapse

propagation d'un influx nerveux

QuestionAnswer
Première étape de la propagation d'un influx nerveux à travers une synapse Influx nerveux traverse l'axone et atteint les corpuscules nerveux terminaux
deuxième étape de la propagation d'un influx nerveux à travers une synapse ouverture des canaux Ca2+ voltage dépendant qui diffuse selon leur gradien dans le corpuscule
Troisième étape de la propagation d'un influx nerveux à travers une synapse Stimulation de la migration des vésicules synaptiques pour les faire fusionner à la membrane présynaptique
Quatrième étape de la propagation d'un influx nerveux à travers une synapse Les neurotransmetteurs sont libérés par exocytose dans la fente synaptique et diffusent vers la membrane post-synaptique
Cinquième étape de la propagation d'un influx nerveux à travers une synapse NT se lient temporairement à des récepteurs portés pas des canaux ligands dépendants afin que ceux-ci s'ouvrent
Quest ce que le PPSE Le potentiel post-synaptique excitateur ;favorise la production d'un influx nerveux
Quest ce que le PPSE Le potentiel post-synaptique inhibiteur ; On éloigne du seuil d'excitation , bloque la transmission d'un message .
neurotransmetteur : dopamine effet excitateur ou inhibiteur. responsable de la sensation de plaisir.
neurotransmetteur : gaba Nt inhibiteur associé a des canaux ligands dépendant de Cl-.. alcool laisse les canaux cl- ouvert plus longtemps
Created by: 529485345
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