Antes de respondermos a esta pergunta, para que existe o sangue, afinal? Em suma, ele serve para alimentar as células e trazer de volta suas impurezas. O sangue leva nutrientes, vitaminas, minerais, aminoácidos, oxigênio, e traz substâncias dispensáveis ao organismo, assim como a célula, que precisa fazer suas "necessidades básicas". E estes dejetos precisam ser retirados do corpo.
Assim, o sistema circulatório desempenha a função de levar nutrientes e trazer as impurezas, além de ser o responsável por abastecer a célula. Ela possui sua membrana, tem sua organela - a mitocôndria - e a mais importante molécula, chamada DNA, onde ela encontra-se protegida.
Com isso, portanto, percebemos que o interior da célula é mais nobre do que o sangue. Isto é, o sangue executa o trabalho de "levar", "trazer" e o mais importante: abastecer a célula - a rainha de todo o processo.
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