Ion channels are hydrophllic pores in a membrane, they are gated this means they are only open when stimulated for example by a voltage.The channels are also selective allowing only some ions to pass[1][2].
References
- ↑ Alberts,Molecular Biology of the cell 5th editon,2008,page 668
- ↑ Alberts,Molecular Biology of the cell 5th editon,2008,page 668