Porquês da vida: água oxigenada + gatos
Autor: Carol Oliveira | Publicado: 2013-01-04T21:12:00-02:00

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Sabe aqueles pirralhos chatos que perguntam tudo? Então, eu sou meio assim. E hoje resolvi compartilhar minhas recentes descobertas inúteis com vocês. Muggle World é cultura, pessoal. -sqn



Por que a água oxigenada descolore os cabelos?



Aulinha de química MODE ON. A
água oxigenada é quimicamente chamada de Peróxido
de Hidrogênio, e tem fórmula molecular H2O2. O H2O2&nbsp;se
decompõe formando água (H2O) e um átomo de oxigênio livre.



H2O2&nbsp;→
H2O +&nbsp;[O]



As estruturas responsáveis pela
cor dos cabelos são proteínas chamadas de&nbsp;melaninas. Esse átomo de
oxigênio livre “quebra” as moléculas de melanina do cabelo, originando
moléculas de menor massa molecular e que apresentam coloração menos intensa. 





Por que os gatos caem em pé?



Isso
acontece porque os bichanos têm um sistema de equilíbrio muuuito mais apurado
que o nosso, que os permite girar o corpo bem rápido para cair sempre nas
quatro patas. A estrutura responsável pelo equilíbrio está no ouvido, e é
chamada de labirinto (é daí que vem a labirintite, aquela doença onde a pessoa
fica tonta de repente). 

Quando
o gato “sente” que vai cair, ocorre um aumento de pressão na região, que
funciona como um alerta para o cérebro; este, por sua vez, manda os músculos se
prepararem para executar o movimento ninja que eu citei no começo. &nbsp;



Adaptado de Revista Mundo Estranho.