Download - Nervoso (1)
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Sistema Nervoso
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Principais funções
• Captação, processamento e resposta aos estímulos (internos ou externos)
• Coordenação e integração dos demais sistemas corporais
• Armazenamento de informações (memória)
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Dividido em três sistemas, basicamente:
- S.N. Central: constituído pelo encéfalo e medula
- S.N. Periférico: formado por nervos (que partem do SNC) e gânglios espalhados pelo corpo (ação local)
- S.N. Autônomo ou vegetativo: coordena as ações de diversos órgãos do corpo e ainda é responsável por respostas imediatas como fuga, medo, susto ...
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Possui três tipos de células:
- Neurônios: Transmissão de impulsos nervosos para outros neurônios e células musculares, memorização...
- Células da Glia: formado pelos Oligodentrócitos: manutenção e preenchimento do S.N.
- Células de Schwann: Formada por bainha de mielina (lipídica) que tem como função isolar os impulsos elétricos entre um neurônio e outro e ainda aumentar a velocidade da transmissão dos impulsos nervosos através de saltos pelos nódulos de Ranvier.
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Orgãos dos sentidos
- Visão- Audição- Olfato- Paladar- Tato
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Globo ocular:
- Camada esclerótica: branca, mais externa, grossa. Na região central se torna fina, transparente a luz: Córnea
- Coróide: Pupila (controla a passagem de luz) e íris (colorido), muito vascularizada
- Retina: fundo do globo, membrana interna (expansão do nervo óptico)
Cones – captam coresBastonetes – captam luz
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- Labirinto: equilíbrio
- Cóclea: audição
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- Papilas caliciformes (V) na face superior da base da lingua
- Fungiformes: toda a língua
- Filiformes: forma de folhas – toda superfície
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- Meissner: tato superficial
- Ruffini: calor
- Frause: frio
- Pacini: Pressão
- Livres: dor
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