Now, of course, if we have some type of small molecules found in close proximity to our cell membrane when pinocytosis takes place it can also engulf those types of small molecules as well as the extracellular fluid. So this is the process by which pinocytosis takes place. So whatever happens to be around the invaginating region on the cell membrane will end up being engulfed into that cell. And that cell will form a vesicle. So this vesicle contains a cell membrane that comes from the cell or it contains the membrane that comes from our cell. So basically, the reason we have the cell membrane is to protect the actual cell from whatever might be inside that vesicle.