anfÍbios
DESCRIPTION
ANFÍBIOS. CARACTERIZAÇÃO GERAL. São apontados como os primeiros vertebrados terrestres; Sofrem, ao fim da fase larval, uma drástica metamorfose, mudando de habitat e, em grande parte, de nicho ecológico. CLASSIFICAÇÃO. Ordens: Anura Urodela Apoda. ESQUELETO. Cartilaginoso no girino - PowerPoint PPT PresentationTRANSCRIPT
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ANFÍBIOS
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CARACTERIZAÇÃO GERAL
• São apontados como os primeiros vertebrados terrestres;
• Sofrem, ao fim da fase larval, uma drástica metamorfose, mudando de habitat e, em grande parte, de nicho ecológico.
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CLASSIFICAÇÃO
• Ordens:– Anura– Urodela– Apoda
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ESQUELETO
• Cartilaginoso no girino• Ósseo no adulto, porém
frágil.
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SISTEMA DIGESTÓRIO
• Completo, terminando em cloaca;
• Ausência de glândulas salivares e dentes.
• Glândulas mucosas na boca.
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SISTEMA RESPIRATÓRIO
• Presença de brânquias na fase larval;
• Presença de cordas vocais.• Órgãos respiratórios na fase
adulta: pulmões, tegumento e mucosa bucal (respiração mucocutânea).
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brônquio
laringe
glote
pulmões
cartilagens
veia pulmonarartéria pulmonar
partições da parede interna do pulmão
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SISTEMA CIRCULATÓRIO
• Larva com coração bicavitário, com circulação fechada e simples;
• Adulto com coração tricavitário (dois átrios e um ventrículo), com circulação fechada, dupla e incompleta.
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SISTEMA EXCRETOR
• Excreção de uréia nos adultos e de amônia nas larvas.
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SISTEMA NERVOSO
• Encéfalo mais desenvolvido que o dos peixes;
• A maior parte das atividades é regulada pelo bulbo;
• Olhos com pálpebras;
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SISTEMA NERVOSO
• Tímpanos recebendo ondas sonoras do ar ou da água;
• Sensibilidade olfativa
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REPRODUÇÃO
• Dióicos;• Fecundação externa com
cópula (excepcionalmente interna sem cópula em alguns caudados);
• Desenvolvimento indireto, o girino é a larva.
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