platelmintos
DESCRIPTION
salabioquimica.blogspot.comTRANSCRIPT
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PLATELMINTOS“Vermes chatos”
• Planária, esquistossomo, solitária etc.
• Corpo achatado dorso-ventralmente.
• Vida livre ou parasitas.
• Surge o sistema excretor.
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• Triblásticos, acelomados e protostômios.
• Surge a simetria bilateral – cefalização, ventre e dorso.
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• Planárias possuem pele mucosa com a superfície ventral ciliada, o que facilita o movimento.
• Respiração cutânea.- algumas espécies são
anaeróbias.
• Ausência de sistema circulatório.
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Digestão• Sistema digestivo
incompleto.
- digestão extra e
intracelular
- intestino ramificado
- tênia não possui
tubo digestivo
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Excreção
• Realizada por células-flama ou solenócitos
• Principal excreta: amônia
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Coordenação
• Sistema nervoso ganglionar ventral
• Início de uma centralização
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Reprodução
• Assexuada
– Fragmentação
• Sexuada– Monóicos ou dióicos
– Fecundação interna
– Desenvolvimento direto (planárias) ou indireto (parasitas)
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Classificação
• Turbellaria – aquáticos e de vida livre.
- ex.: planária
• Trematoda – parasitas com ventosas de fixação.
- ex.: esquistossomo
• Cestoda – parasitas com corpo formado por segmentos.
- ex.: tênia
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Barriga d’água ou esquistossomose
• Agente causador – Schistosoma mansoni
• Ciclo cutâneo-fecal (heteróxeno)
- Homem (HD)
- Caramujo Biomphalaria (HI)
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Sintomas
• Problemas no fígado, baço e intestino;
• Diarréias, dores abdominais e emagrecimento;
• Hepatoesplenomegalia;• Ascite;• Dermatites cercarianas
e coceiras.
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Ciclo
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Profilaxia
• Tratamento de doentes;
• Melhoria das condições sócio-econômicas;
• Utilização de redes de esgoto ou fossas sanitárias;
• Educação sanitária (higiene);
• Combate ao caramujo (moluscocidas ou controle biológico);
• Evitar contato com lagoas contaminadas.
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Teníase (solitária)
• Agente causador – Taenia solium e Taenia saginata (adulto)
• Ciclo oral-fecal (heteróxeno)
- Homem (HD)
- Porco ou boi (HI)
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Sintomas
• Dor abdominal, dor de cabeça;
• Diarréia, flatulência, aumento ou perda do apetite;
• Fraqueza e palidez.
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Ciclo
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Profilaxia
• Tratamento de doentes;
• Higiene;
• Saneamento básico;
• Inspeção de carnes em abatedouros;
• Consumo de carnes suínas ou bovinas e seus derivados bem cozidos.
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Cisticercose• Causador – cisticerco ( larva da tênia do porco).
• Ciclo oral-fecal – Homem atua como hospedeiro intermediário.
• Contaminação – ingestão de ovos de Taenia solium.
• O cisticerco pode alojar-se nos olhos, músculos, pele ou cérebro, podendo ser fatal.
• Profilaxia – higiene e saneamento básico.
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