Diffusion mixes things very well, but as the size gets bigger, diffusion becomes very slow.

扩散作用使物质充分混合,但随着细胞变大后,扩散作用就捉襟见肘了

耶鲁公开课 - 生物医学工程探索课程节选

This is a mechanism by which an electrical signal comes here, it gets translated into a chemical signal, the chemical diffuses across the gap and reinitiates a - an electrical signal in the next cell and that's one way that it happens.

这就是电信号产生的机理,电信号翻译成化学信号,化学物质扩散过突触间隙,重新激起下个细胞中的电信号,这是一种方式

耶鲁公开课 - 生物医学工程探索课程节选