Qual a diferença entre veias e artérias - Yahoo! Respostas

Qual a diferença entre veias e artérias - Yahoo! Respostas

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                            <meta property="og:description" content="As veias e artérias, assim como os capilares, constituem os vasos sangüíneos do sistema circulatório do nosso corpo. As artérias correpondem aqueles vasos que saem do coração e por isso estão ">
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        <h1 class="subject">Qual a diferença entre veias e artérias?</h1>
                  <div class="content">Explique-me por favor.<br>
Além desses também tem os vasos sangüíneos.</div>
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          <li><abbr title="2006-09-24 15:59:44 +0000">7 anos atrás</abbr></li>
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                                    <h2><span>Melhor resposta</span> - Escolhida pelo autor da pergunta</h2>
                              <div class="content">As veias e artérias, assim como os capilares, constituem os vasos sangüíneos do sistema circulatório do nosso corpo. As artérias correpondem aqueles vasos que saem do coração e por isso estão sob alta pressão contantemente, dessa forma necessitam de uma parede mais espessa e elástica, a fim de manter uma pressão adequada para oxigenação/nutrição das células. As veias são aqueles vasos q chegam ao coração e possuem uma caracerística, denominada complacência, a qual ela é capaz de comportar grande volumes de sangue. Por esse motivo, algumas veias possuem válvulas para evitar o refluxo do sangue e, basicamente, qnd há falência dessas válvulas formam-se as varizes. Uma coisa importante de se saber, é q não c pode dizer q as veias carregam sangue pobre em oxigênio e as artérias em sangue rico em oxigênio, pq a artéria pulmonar é pobre em O2, pois ainda passará pelos alvéolos para ser oxigenada e por sua vez a veia pulmonar leva o sangue cheio de O2 de volta para o coração e daí para o corpo.<br>
 <br>
Assim, eu acho q tentei explicar, mas c ficou complexo desculpem! Só perguntar de novo q eu tento melhorar, ok?</div>
              <h3 class="reference">Fonte(s):</h3>
        <div class="reference">Anatomia orientada para clínica - Keith l. Moore, Arthur F. Dalley</div>
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                  <li><abbr title="2006-09-24 23:43:26 +0000">7 anos atrás</abbr></li>
                        
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            <dd class="desc">Obrigado, sua resposta foi clara. Outras duas pessoas deram boas respostas, mas eu tive que escolher uma só.</dd>
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            <div class="content">Somos todos "recheados" com vasos sanguíneos, que levam o sangue de um local a outro.<br>
<br>
As veias se caracterizam por transportar sangue venoso, pobre em oxigênio e que cujo destino é o pulmão, para se renovar e se encher com oxigênio novamente. Geralmente carregam um sangue mais escuro.<br>
<br>
As artérias transportam sangue rico em oxigênio para os órgãos. Elas saem do pulmão e irrigam os diversos órgãos do seu corpo. Esse sangue despeja o oxigênio nos órgãos e voltam ao pulmão, pelas veias.</div>
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                  <li><abbr title="2006-09-24 16:04:08 +0000">7 anos atrás</abbr></li>
                        
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            <div class="content">Vasos Sanguíneos são divididos entre: Veias, Artérias e também Capilares.<br>
Constantemente a maioria das pessoas costuma classificar erroneamente, assim: As veias são os vasos que transportam o sangue venoso, e artérias transportam o sangue arterial... Isso está incorreto, pois independentemente do tipo de sangue que transportam as Artérias, são vasos que SAEM do coração, suas paredes são mais grossas e não possuem válvulas e  as Veias, são os vasos que CHEGAM ao coração, suas paredes são mais finas, são dotados de válvulas (para regular o fluxo de sangue de baixo para cima). Assim, tanto as Artérias quanto as Veias podem transportar sangue rico em oxigênio (arterial) ou pobre nesse gás (venoso), pois há um momento na ocorrencia da circulação que os vasos trocam de papéis, ou seja, o sangue venoso passa na artéria pulmonar, e o sangue arterial passa na veia pulmonar. E entre as arterias e as veias ficam os vasos capilares que permitem a troca de substâncias entre o sangue e os tecidos.<br>
Espero ter ajudado! ;-)</div>
              <h3 class="reference">Fonte(s):</h3>
        <div class="reference">Biologia 2 - Autores: Cesar e Sezar<br>
P.S: Ah! E uma curiosidade, o pesquisador e definidor dessas classificações dos Vasos, foi, por incrível que pareceça, Leonardo Da Vinci, que exumava cadáveres para estudar o funcionamento do corpo humano!</div>
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            <div class="content">Os vasos sanguíneos são: As artérias, que levam sangue do coração para os órgãos ( por isso o sangue é chamado arterial ) e as veias, que fazem o caminho inverso ( sangue venoso ).<br>
Um abraço!</div>
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            <div class="content">Os vasos sangüíneos compreendem: artérias, arteríolas, veias, vênulas e capilares. As artérias são vasos de maior calibre pois levam o sangue do coração para todo o corpo, com alta pressão. O nome de artéria é dado pois a maioria (não todas, por exemplo a artéria tronco pulmonar) delas transportam sangue arterial, rico em oxigênio. As veias são vasos menos calibrosos, com a camada muscular mais fina, pois transportam o sangue do corpo para o coração, com menos pressão. O nome veia é dado a elas porque a maioria (não todas, por exemplo, as veias pulmonares) transportam sangue venoso (pobre em oxigênio). Os capilares são vasos sanguíneos muito finos, onde pode ter tanto sangue arterial quanto venoso.</div>
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            <div class="content">Olha, pelo que sei, as veias se diferem das artérias por dois grandes principios:<br>
1-) as veias possuem válvulas que impedem o refluxo do sangue, permitindo assim a manutenção circulação sangüínea, enquanto as artérias "operam" por intermédio da gravidade (e das válvulas venosas);<br>
<br>
2-) geralmente, as veias comportam o sangue venoso, ou seja, o sangue que está carregado de CO2, enquanto as artérias "levam", em geral, o sangue carregado de oxigênio.<br>
<br>
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            <div class="content">As artérias levam sangue do coração para todas as partes do corpo e as veias fazem o caminho inverso.</div>
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            <div class="content">As artérias levam para o corpo o sangue depois de oxigenado nos pulmões!<br>
As veias transportam o sangue venoso, para ser oxigenado!<br>
Os vasos sanguíneos levam o sangue oxigenado, por osmose com as artérias a todas as células do corpo e depois depositam-nos nas veias igualmente por osmose!</div>
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            <div class="content">Vamos simplificar: um transporta sangue rico em O2 e outro pobre em O2.</div>
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                  <li><abbr title="2006-09-24 23:54:18 +0000">7 anos atrás</abbr></li>
                        
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            <div class="content">As veias transportam sangue venoso e as arterias transportam sangue arterial.</div>
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                  <li><abbr title="2006-09-24 19:13:26 +0000">7 anos atrás</abbr></li>
                        
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            <div class="content">Nas artérias circula o sangue arterial, ou seja, rico em gás oxigênio. Nas veias circula o sangue venoso, rico em bicarbonato(o organismo converte gás carbônico em bicarbonato em razão do controle do PH do sangue segundo a seguinte reação: CO2+H2O <-> H2CO3 <-> H+ + HCO3-). Nos capilares ocorrem as trocas gasosas de gás oxigênio em gás carbônico.</div>
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                  <li><abbr title="2006-09-24 16:10:14 +0000">7 anos atrás</abbr></li>
                        
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            <div class="content">veias:vasos q conduzem sangue ao coraçao<br>
<br>
arterias:vasos q conduzem o sangue do coraçao a todas as partes do corpo.</div>
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                  <li><abbr title="2006-09-24 16:14:56 +0000">7 anos atrás</abbr></li>
                        
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  </ul>  </div>            <div class="qa-container">
            <div class="content">O calibre. As veias são mais "finas" menos calibrosas, já as ártérias são bem mais "grossas".</div>
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                  <li><abbr title="2006-09-26 18:43:29 +0000">7 anos atrás</abbr></li>
                        
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            <div class="content">Essa diferença foi criada pelos donos de universidades e  faculdades para confundir as pessoas e faze-las tirarem um ZERO nas provas e assim podendo cobrar mais vzs do aluno.</div>
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