O nosso cérebro e as drogas
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O nosso cérebro e as drogas
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O cérebro está dividido em áreas com funções específicas.
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O sistema de recompensa.
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Para que serve este sistema?
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As drogas afectam sobretudo o sistema de recompensa.
amígdala
Córtex pré-frontal
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Milhões de neurónios em circuitos de comunicação que formam redes altamente complexas e
organizadas.
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Os neurónios são as principais células do nosso cérebro
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As drogas actuam nas sinapse, zonas de comunicação entre neurónios
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Na sinapse.....
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quando chega a ecstasy...
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Sinapse sem actividade
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Normal 2 semanas depois
Após 7 anos sem consumir
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E o comportamento?
Normal Logo depois de consumir ecstasy:
bem estar e euforia
Com o tempo…
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Com o tempo…. Depressão
. Alteração do ciclo de sono
. Perda de capacidade de memorização
. Dificuldades de concentração
. Desmotivação
. Desinteresse sexual
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Pulmões
Coração
Rins
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Porque não devo beber álcool se consumir de
ecstasy?
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Estudar o comportamento animal
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Radial Maze
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Actividade cerebral após consumo, as zonas amarelas são as mais activas…
normal
10 dias depois
100 dias depois
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A “memória” das drogas é preservada na amígdala.
amígdala inactiva amígdala activa
Video sobre natureza Video sobre cocaína
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Investigadores IBMC. Teresa Summavielle. Pedro Melo
Núcleo de Cultura Científica. Júlio Santos
. Rita Portela
. Anabela Nunes