tag:blogger.com,1999:blog-48999522372886917312024-03-13T01:37:50.232+00:00CANTINHO DA CIÊNCIAPaula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.comBlogger147125tag:blogger.com,1999:blog-4899952237288691731.post-41482121273267414662016-09-24T23:29:00.001+01:002016-09-24T23:29:32.734+01:00Floresta Autóctone Plantar e Valorizar<iframe allowfullscreen="" frameborder="0" height="344" src="https://www.youtube.com/embed/lraLbxcNMwY" width="459"></iframe>Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-26849061548663287742016-04-14T19:33:00.000+01:002016-04-14T19:39:20.075+01:00<div dir="ltr" style="text-align: left;" trbidi="on">
<b><span style="font-family: "arial" , "helvetica" , sans-serif; font-size: large;">Poema das árvores </span></b><br />
<br />
As árvores crescem sós. E a sós florescem.<br />
Começam por ser nada. Pouco a pouco<br />
se levantam do chão, se alteiam palmo a palmo.<br />
Crescendo deitam ramos, e os ramos outros ramos,<br />
e deles nascem folhas, e as folhas multiplicam-se.<br />
Depois, por entre as folhas, vão-se esboçando as flores,<br />
e então crescem as flores, e as flores produzem frutos,<br />
e os frutos dão sementes,<br />
e as sementes preparam novas árvores.<br />
<br />
E tudo sempre a sós, a sós consigo mesmas. […]<br />
<br />
Virtude vegetal viver a sós<br />
e entretanto dar flores.<br />
<br />
António Gedeão, 1999, p. 104</div>
Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com1tag:blogger.com,1999:blog-4899952237288691731.post-30543905377563977572016-02-14T22:16:00.001+00:002016-02-14T22:16:58.316+00:00Suberina, a alma da cortiça<a href="http://ensina.rtp.pt/artigo/suberina-a-alma-da-cortica/#sthash.o9ChDaDN.cmfs">Suberina, a alma da cortiça</a>Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-56826684827899975382015-04-08T23:02:00.001+01:002015-04-08T23:02:11.240+01:00Aranha Pavão e seu estranho ritual de acasalamento (Maratus volans) | Ci...<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/p48WPW4AXdU" width="480"></iframe>Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-39452580976518430022015-04-08T22:51:00.001+01:002015-04-08T22:51:20.765+01:00MERGULHÃO-DE-CRISTA RTP (c)<iframe allowfullscreen="" frameborder="0" height="344" src="https://www.youtube.com/embed/aULpyrh3mCw" width="459"></iframe>Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-57535663205733860742015-02-02T18:46:00.001+00:002015-02-02T18:48:31.775+00:00Documentário - Portugal Terra - A Natureza em Portugal HD<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/SdcZ0r_2h_Q" width="480"></iframe></div>
Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-3932422678424004562015-02-02T18:43:00.001+00:002015-02-02T18:48:03.805+00:00AS AVES MAIS BONITAS DO MUNDO!<div dir="ltr" style="text-align: left;" trbidi="on">
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Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-80912898754844406172015-02-02T18:29:00.003+00:002015-02-02T18:47:40.569+00:00Revestimento dos animais:pelos e penas<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="344" src="https://www.youtube.com/embed/X1dbblBKExs" width="459"></iframe></div>
Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-53916913115673890842015-02-02T18:29:00.001+00:002015-02-02T18:29:30.165+00:00Revestimento dos animais:pelos e penas<iframe allowfullscreen="" frameborder="0" height="344" src="https://www.youtube.com/embed/X1dbblBKExs" width="459"></iframe>Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-17752627609470464212013-01-24T09:47:00.001+00:002013-01-24T09:47:30.660+00:00A Vida da Plantas <iframe allowfullscreen="" frameborder="0" height="270" src="http://www.youtube.com/embed/o0CSQ4PIbqA" width="480"></iframe><br />
Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-90164777353153859602013-01-23T17:24:00.000+00:002013-01-23T19:14:27.231+00:00<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="color: #783f04; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif;"><span style="font-size: large;"><b>Plantas sem flor</b></span></span><br />
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<span style="font-family: Verdana, sans-serif;"><span class="Apple-tab-span" style="white-space: pre;"></span>As<span style="color: #783f04;"><span class="apple-converted-space"> </span><span class="Apple-style-span" style="font-weight: bold;">plantas sem flor</span></span>, como por exemplo os musgos e os fetos, não </span><br />
<span style="font-family: Verdana, sans-serif;">produzem </span><span style="font-family: Verdana, sans-serif; line-height: 1.4;">sementes </span><span style="font-family: Verdana, sans-serif; line-height: 1.4;">e apresentam um processo reprodutor diferente</span><br />
<span style="font-family: Verdana, sans-serif; line-height: 1.4;">do das plantas </span><span style="font-family: Verdana, sans-serif; line-height: 1.4;">com flor.</span><span style="font-family: Verdana, sans-serif; line-height: 1.4;"></span><br />
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<b style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"><i>MUSGO</i></b><br />
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"><span class="Apple-style-span"><span class="Apple-tab-span" style="white-space: pre;"></span>Todas as plantas sem flor, vivem em locais </span><span class="Apple-style-span">húmidos e sombrios</span><span class="Apple-style-span">. </span><span class="Apple-style-span"><o:p></o:p></span></span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"><span class="Apple-tab-span" style="white-space: pre;"></span>Em determinada época do ano, estas plantas produzem, em </span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">estruturas próprias, </span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">umas células especializadas para a reprodução</span><br />
<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"> </span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">-</span><span class="apple-converted-space" style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"> </span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">os esporos. Quando essas células estão maduras e devidamente </span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">formadas espalham-se com a ajuda do vento e só dão origem a um</span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">a</span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">nova planta quando encontram condições para isso.</span><br />
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<span style="background-color: white; font-family: Verdana, sans-serif; line-height: 18px; text-align: left;"><span style="color: #333333; font-family: Verdana, sans-serif;">O </span><span class="Apple-style-span" style="color: #783f04; font-family: Verdana, sans-serif; font-weight: bold;">MUSGO</span><span style="color: #333333; font-family: Verdana, sans-serif;"> não possui verdadeiros tecidos tal como as restantes </span></span></div>
<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px; text-align: left;">plantas. </span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px; text-align: left;">Possui uma estrutura parecida com as raízes, os rizoides, </span><br />
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px; text-align: left;">outra parecida </span><span class="Apple-style-span" style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px; text-align: left;">com o caule, </span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px; text-align: left;">o cauloide e outra estrutura parecida</span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px; text-align: left;">com as folhas, os filoides. </span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">Como é uma planta extremamente pequena, não necessita </span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">de </span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">vasos</span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">condutores que conduzem água, sais minerais e nutrientes até todas </span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">as partes da planta. Estes são transportados de célula a célula por </span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">toda a planta. </span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">Na época reprodutiva a planta forma um filamento com uma cápsula</span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">na extremidade que contém esporos. Quando os esporos estão </span></div>
<span style="font-family: Verdana, sans-serif;"><span style="line-height: 1.4;">maduros, a cápsula abre-se e estes espalham-se, com a ajuda do vento</span><span style="color: #333333;"><span style="line-height: 18px;">.</span></span></span><br />
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<span class="Apple-style-span" style="font-family: Verdana, sans-serif;">Musgos</span></div>
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<span class="Apple-style-span" style="background-color: white; font-family: Verdana, sans-serif; line-height: 18px;"><span style="color: #333333;">Os</span><b style="color: #333333;"> </b><span class="Apple-style-span" style="color: #783f04; font-weight: bold;">FETOS</span><b style="color: #333333;"> </b><span style="color: #333333;">e as</span><b style="color: #333333;"> </b><span class="Apple-style-span" style="color: #783f04; font-weight: bold;">AVENCAS</span><b style="color: #333333;"> </b><span style="color: #333333;">são plantas bastante maiores que os </span></span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"><span class="Apple-style-span">musgos </span></span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">e desta forma possuem vasos condutores. Têm verdadeiros</span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">tecidos como </span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">raízes</span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">, </span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">caule</span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"> (neste caso </span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">subterrâneo - rizoma</span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">) e </span></div>
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<span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">folhas</span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"> com pecíolo </span><span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">bastante alongado e limbo muito recortado. </span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"><span class="Apple-style-span">Na página inferior das folhas existem </span><span class="Apple-style-span">soros</span><span class="Apple-style-span"> que na altura da</span></span></div>
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<span style="background-color: white; color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"><span class="Apple-style-span">reprodução </span></span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">se enchem de </span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">esporos</span><span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;"> e posteriormente são levados </span></div>
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<span class="Apple-style-span" style="color: #333333; font-family: Verdana, sans-serif; line-height: 18px;">pelo vento.</span></div>
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Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-7918727822517612852013-01-23T16:41:00.000+00:002013-01-23T16:55:45.170+00:00Nascimento de um golfinho<div dir="ltr" style="text-align: left;" trbidi="on">
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O período de gestação do golfinho pode variar segundo a espécie, mas geralmente demora entre 10 e 12 meses.</div>
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Quando o golfinho é expulso do interior do corpo materno, não sai de cabeça como os humanos, mas sim de cauda. O cordão umbilical que o une à sua mãe rompe-se e o recém-nascido nada até à superfície, ajudado pela sua mãe ou por outras fêmeas.</div>
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O primeiro alimento de um golfinho é o leite materno que fará parte da sua vida durante um ano no mínimo, mas a partir dos seis meses de idade começará a comer também alguns peixes. A cria de golfinho nada muito perto da mãe, especialmente no inicio da sua vida. Pouco a pouco se afastará até ser independente.</div>
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Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-21077884685474278362013-01-06T12:46:00.001+00:002013-01-06T12:50:11.333+00:00O PRINCÍPIO DA VIDA<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-family: Arial; font-size: 16pt;"><a href="http://www.youtube.com/watch?v=Mp68qAT_fFc">Episódio 1: A Chegada</a></span></div>
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<span style="font-family: Arial;"><br /></span><span style="font-family: Arial; font-size: 14pt;">A viagem de David Attenborough começa numa floresta perto da casa na qual viveu durante a infância, em Leicester, onde a descoberta de um fóssil, transformou a nossa compreensão da evolução da vida complexa. Viajando do litoral enevoado de Newfoundland ao outback australiano, Attenborough revela as primeiras formas de vida animal a existirem na Terra. Esses seres estranhos e maravilhosos são trazidos de volta à vida com o auxílio de tecnologia de ponta e efeitos visuais foto realistas. Esses foram os seres que desenvolveram as características e recursos que possibilitaram que todos os animais, incluindo nós mesmos, sobrevivessem até hoje.</span></div>
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<span style="font-family: Arial; font-size: 16pt;"><a href="http://www.youtube.com/watch?v=ZSTLv1joD4U">Episódio 2: A Conquista</a></span></div>
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<span style="font-family: Arial;"><br /></span><span style="font-family: Arial; font-size: 14pt;">A viagem de David Attenborough continua nas Montanhas Rochosas, onde os fósseis registam uma explosão na diversidade animal nunca vista. Viajando de lá ao Norte de África, às florestas tropicais da Austrália e ao litoral leste da Escócia, Attenborough descobre como os animais evoluíram para conquistar não apenas os oceanos, mas também a terra e o ar. </span></div>
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Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-23675551086956488902012-11-11T20:20:00.001+00:002012-11-13T10:55:20.574+00:00DIMORFISMO SEXUAL<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-family: Georgia, Times New Roman, serif;"><b><span style="font-size: large;">Dimorfismo sexual </span></b>– diz-se que existe dimorfismo sexual,
para uma espécie, quando é possível distinguir facilmente o macho da fêmea pelo
seu aspeto exterior.</span><br />
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<span style="font-family: Georgia, Times New Roman, serif;"><span style="background-color: white; color: #373737; line-height: 24px;">O pato-real (</span><span style="background-color: white; border: 0px currentColor; color: #373737; line-height: 24px; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">Anas platyrhynchos</span><span style="background-color: white; color: #373737; line-height: 24px;">) é presença assídua em ribeiras e jardins com lagos.</span><a href="http://www.arcadedarwin.com/wp-content/uploads/2012/04/pato-real32.jpg" style="background-color: white; border: 0px currentColor; color: #1982d1; line-height: 24px; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><img alt="" class="alignright size-medium wp-image-83" height="300" src="http://www.arcadedarwin.com/wp-content/uploads/2012/04/pato-real32-224x300.jpg" style="border: 1px solid rgb(221, 221, 221); display: inline; float: right; height: auto; margin-bottom: 1.62em; margin-left: 1.62em; margin-top: 0.4em; max-width: 97.5%; padding: 6px;" title="pato-real3" width="224" /></a><span style="background-color: white; color: #373737; line-height: 24px;">Como acontece com muitas outras aves, esta espécie é sobretudo fácil de identificar observando o macho. Este tem bico amarelo, cabeça esverdeada, dorso acinzentado e peito castanho escuro, enquanto que a fêmea é castanho claro. O macho também é ligeiramente maior. Este tipo de dimorfismo sexual é comum em aves e mamíferos. </span></span></div>
Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-49200685643767106812012-10-15T16:56:00.002+01:002012-10-15T18:20:05.217+01:00DIVERSIDADE DE FORMAS DE LOCOMOÇÃO<div dir="ltr" style="text-align: left;" trbidi="on">
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<b><span style="font-size: large;"><a href="http://www.youtube.com/watch?v=nRaBxh9Ff98&feature=related">LOCOMOÇÃO NO SOLO, NA ÁGUA E NO AR</a></span></b></div>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: large;"><a href="http://zoo-centro-pedagogico.blogspot.pt/2012/03/como-se-deslocam-os-animais.html">MARCHA</a></span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: large;"><a href="http://www.portalsaofrancisco.com.br/alfa/classe-aves/voo-das-aves-2.php">VOO</a></span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: large;"><a href="http://zoo-centro-pedagogico.blogspot.pt/2012/03/como-se-deslocam-os-animais.html">NATAÇÃO</a></span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: large;"><a href="http://zoo-centro-pedagogico.blogspot.pt/2012/03/como-se-deslocam-os-animais.html">REPTAÇÃO</a></span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: large;"><a href="http://zoo-centro-pedagogico.blogspot.pt/2012/02/braquiacao-um-tipo-de-locomocao.html">BRAQUIAÇÃO</a></span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: large;"><a href="http://zoo-centro-pedagogico.blogspot.pt/2012/03/como-se-deslocam-os-animais.html">CORRIDA</a></span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: large;"><a href="http://zoo-centro-pedagogico.blogspot.pt/2012/03/como-se-deslocam-os-animais.html">SALTO</a></span></td></tr>
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Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com1tag:blogger.com,1999:blog-4899952237288691731.post-73977005898992792242012-10-14T18:00:00.000+01:002012-10-15T18:11:31.448+01:00AS AVES E O VOO<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5ZSAIbZhyQF9Pj337jdwyDTO7lfME5un6bpxYcvK-zFFBk5W5RNmCLBZUG2VNg_X9UZzpj2QH8UhpFKduEeCjrx5dTAeoeVYcsHqCIIVNIqkkocZ3RRi-1uPhuTQLoYH4TNGtoxJOE2Cv/s1600/ave01.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="156" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5ZSAIbZhyQF9Pj337jdwyDTO7lfME5un6bpxYcvK-zFFBk5W5RNmCLBZUG2VNg_X9UZzpj2QH8UhpFKduEeCjrx5dTAeoeVYcsHqCIIVNIqkkocZ3RRi-1uPhuTQLoYH4TNGtoxJOE2Cv/s400/ave01.jpg" width="235" /></a></div>
Há características na estrutura dos corpos das aves que permitem que elas voem. As aves têm corpo em <b>forma de fuso ou aerodinâmica</b> o que diminui o atrito com o ar.
No que diz respeito aos ossos, as aves têm o <b>esterno</b> (osso do peito) <b>em forma de quilha.</b><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJvTOQvAxNKdnCFJfBXx1IGT_BEn-nxg8AShPT7Vvr4Gsl3ZDgD5j4es8zhYgBgGjbda42PbbZ-u3y8La2yp5IWRuPSpp4PCmn9URbogD527lnnzdsgrLV-Ju7PnrNA7E-ZmCSJxG2JxkP/s1600/esterno.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="194" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJvTOQvAxNKdnCFJfBXx1IGT_BEn-nxg8AShPT7Vvr4Gsl3ZDgD5j4es8zhYgBgGjbda42PbbZ-u3y8La2yp5IWRuPSpp4PCmn9URbogD527lnnzdsgrLV-Ju7PnrNA7E-ZmCSJxG2JxkP/s400/esterno.jpg" width="259" /></a></div>
Para além disso os ossos das aves são chamados de <b>ossos pneumáticos</b>, ou seja, não são maciços, embora tenham a mesma resistência dos ossos de outras espécies de animais. Devido a esta característica, as aves são mais leves do que os mamíferos, por exemplo.
Outra característica que possibilita o voo são as <b>penas</b>. As penas das aves são de origem epidérmica. São <b>leves, impermeáveis ao ar e à agua</b> e mantêm a temperatura corporal.
Observa a estrutura de uma pena.<br />
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NOTA: o cálamo também tem o nome de tubo e a ráquis de eixo.
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Os diferentes tipos de penas têm funções distintas no corpo das aves:as remiges são as penas fortes do voo que se situam na margem posterior das asas; as tetrizes cobrem todo o corpo e as plúmulas ou penas de cobertura são pequenas, revestem todo o corpo das aves e têm como principal função o aquecimento; as retrizes que formam a cauda são geralmente, longas e fortes e servem para orientar o voo, como o leme de um navio. O conjunto de todas as penas de uma ave é chamado de plumagem e o processo de substituição das penas é conhecido como muda.
As penas das aves que vivem na água são impermeabilizadas, através de um óleo lubrificante que elas próprias produzem numa glândula chamada uropigial, existente na base da cauda. A ave espreme a glândula com o bico e espalha o óleo pelas penas.
Outra caracteristica que torna possível que as aves voem é a <b>forte</b> <b>musculatura peitoral,</b> que permite que a ave mantenha o ritmo do bater de asas constante. Em comparação com o homem, considerando as devidas proporções, as aves tem a musculatura peitoral inúmeras vezes mais forte.
Os pulmões das aves são muito diferentes dos demais animais, e o seu sistema, que conta com os chamados <b>“sacos aéreos”</b>, é muito eficaz em relação às trocas gasosas, inclusive por diminuir a densidade das aves durante o voo.<br />
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<b>Em síntese<b></b></b>, <b>o corpo das aves possui adaptações próprias para voar:
corpo com forma aerodinâmica;
ossos pneumáticos (ocos e leves);
corpo revestido por penas;
músculos peitorais fortes;
esterno em forma de quilha, que ajuda a "cortar o ar";
pulmões ligados a sacos aéreos, o que torna as aves mais leves.</b>
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Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-7285073317538297822012-10-14T17:15:00.003+01:002012-10-14T17:17:43.566+01:00O MUNDO DAS AVES<iframe allowfullscreen="" frameborder="0" height="344" src="http://www.youtube.com/embed/uWAukyqpHzQ?fs=1" width="459"></iframe>Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-64466949214798729992012-10-14T17:15:00.001+01:002012-10-14T17:20:31.117+01:00<iframe allowfullscreen="" frameborder="0" height="344" src="http://www.youtube.com/embed/OnYYoUMIBdk?fs=1" width="459"></iframe>Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-51356888965397334822012-10-14T17:14:00.001+01:002012-10-14T17:21:05.957+01:00<iframe allowfullscreen="" frameborder="0" height="344" src="http://www.youtube.com/embed/RDh39BHvMxU?fs=1" width="459"></iframe>Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-1882070435763593372012-10-01T18:48:00.002+01:002012-10-01T18:52:27.319+01:00A FORMA DOS ANIMAIS<div dir="ltr" style="text-align: left;" trbidi="on">
<br /></div> OS ANIMAIS APRESENTAM FORMAS DO CORPO MUITO VARIADAS, CONSOANTE O AMBIENTE, O SEU HABITAT E O MODO DE VIDA.
<iframe src="http://www.slideshare.net/slideshow/embed_code/2158664" width="427" height="356" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" style="border:1px solid #CCC;border-width:1px 1px 0;margin-bottom:5px" allowfullscreen> </iframe> <div style="margin-bottom:5px"> <strong> <a href="http://www.slideshare.net/treis/forma-do-corpo" title="Forma Do Corpo" target="_blank">Forma Do Corpo</a> </strong> from <strong><a href="http://www.slideshare.net/treis" target="_blank">Tânia Reis @ EB 2/3 Cristelo</a></strong> </div>Paula Igrejashttp://www.blogger.com/profile/09632684085880278301noreply@blogger.com0tag:blogger.com,1999:blog-4899952237288691731.post-36201681807396299362012-09-24T12:34:00.001+01:002012-09-24T12:58:33.746+01:00ONDE EXISTE VIDA?<b>A Terra é um planeta cheio de vida. Um olhar mais atento permite-nos descobrir vida numa grande variedade de ambientes, com características bem distintas, uns aquáticos outros terrestres.</b>
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