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Exercício de Intensidade de corrente e bomba de sódio
por Ulisses José Raminelli (Vestibular da Universidade Federal de Goiás)
Difícil Sunday, May 25th, 2014
Exercício:
O transporte ativo de Na + e K + através da membrana celular é realizado por uma proteína complexa, existente na membrana, denominada “sódio-potássio-adenosina-trifosfatase” ou, simplesmente, bomba de sódio. Cada bomba de sódio dos neurônios do cérebro humano pode transportar, por segundo, até 200 Na + para fora da célula e, 130 K + para dentro da célula. Dado: carga elementar do elétron 1,6 . 10 – 19 C. Sabendo-se que um pequeno neurônio possui cerca de um milhão de bombas de sódio, calcule a carga líquida que atravessa a membrana desse neurônio.
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