what do mean by polarised cells?????????????plese reply fast........b'cause i have eam day after 2morrow

A cell membrane or neuronal membrane with resting potential across it is said to be polarised. Polarisation of membrane occurs due to difference in ion concentration(resting potential). Outside the plasma membrane is extracellular fluid which is positively charged with respect to the cell contents inside the plasma membrane which is negatively charged. This difference in electric charges is responsible for polarised membrane.