revestimento dos animais
TRANSCRIPT
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O revestimento do corpo
protege-os das agressões
do meio ambiente e lhes
permite uma relação
adequada entre o interior e
o exterior do organismo.
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O revestimento dosanimais vertebrados,ou seja, o que oscobre, é a pele, queé formada por duascamadas:
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Der
me
Epid
erm
e
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Epiderme:
Camada mais
exterior da pele.
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Derme•Camada mais interior da
pele onde se encontram
os vasos sanguíneos, as
glândulas produtoras de
suor, etc.
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O Revestimento de
um Animal é a
camada exterior do
corpo, em contacto
com o ambiente.
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Funções do
RevestimentoO revestimento varia com
as espécies e apresenta
diversas funções:
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• Proteger contra agentes do
ambiente
• Regular a
temperatura do
corpo.
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• Servir de
superfície
respiratória.
• Servir de
camuflagem
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• Excretar substâncias
• Impedir a entrada de
parasitas
• Receber estímulos que
permitem sentir o ambiente
(frio, calor, dor…).
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É característica dos Anfíbios.
Estes animais respiram, em
grande parte, através da pele
– respiração cutânea – pelo
que têm de a manter sempre
húmida, vivendo em
ambientes ricos em água.
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É uma estrutura
essencialmente calcária e
pode ser univalve (uma
peça única – caracol, lapa)
ou bivalve (duas peças
articuladas – amêijoa).
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É característico dos animais
Invertebrados (insectos). É um
revestimento resistente, duro e
impermeável, que os protege da
desidratação e das agressões
ambientais. À semelhança dos
répteis também têm necessidade
de mudar a pele.
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Em alguns animais o
revestimento de quitina é
reforçado por uma
substância calcária,
formando uma crusta, que
lhes dá mais resistência
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ou profundas
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São características dos
Peixes. Têm origem na
derme e acompanham o
crescimento do animal,
facilitam a deslocação no
meio aquático, já que são
geralmente lisas.
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ou superficiais
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São características dos Répteis.
Não acompanham o crescimento
dos animais (muda de pele). Têm
origem na epiderme. Protegem o
corpo destes animais que, de um
modo geral, se deslocam arrastando-
se e impedem as perdas de água
para o ambiente (geralmente vivem
em locais secos).
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São características das Aves. Não
deixam passar a água e o ar. É o
facto de serem impermeáveis ao ar
que permite às Aves voarem. São
uma barreira às perdas de calor por
conservarem por debaixo de si uma
camada de ar quente e manterem
assim a temperatura
corporal.
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São característicos dos
Mamíferos. A cobertura de
pêlos contribui para manter a
temperatura do corpo e é, em
muitos casos,
impermeável à água.
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