来自《耶鲁大学开放课程：生物医学工程探索 第15集 第15集》
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This one is a potassium channel,这是一个钾离子通道 -
and so if it is open it allows to potassium to pass through.如果处于开放状态 钾离子就可以通过 -
It only allows passive transport.只能主动运输 -
It's not a machine like the other one,这些并不是像前面说的那种小机器 -
it's just a portal or a hole而只是一个入口 一个孔洞 -
that allows potassium to move down its concentration gradient.可以允许钾离子顺浓度梯度穿过 -
If this potassium channel is open,如果钾离子通道开放 -
then potassium will naturally move.钾离子就会自然流动 -
It will move from high to low concentration,从高浓度一侧流向低浓度一侧 -
that is,it'll move from inside the cell to out.也就是从细胞内流向细胞外 -
If sodium--如果钠-- -
if there's a channel for sodium and it happens to be open,如果钠离子通道处于开放状态