Re: merray naal
^ aaaj off thay kiya 
( 
) khummi look wat he is sayin 
Khumi: yaar its simple …
think of it as a membrane double layered madeup of phospholipids n other proteins. Its like a barrier yaar. Somethings can pass through n some cannot .. all depends on the structure of the membrane. All these details aint matter much .. well actually they r .. in pharmo 