Now, Pinocytosis is not a specific process meaning it doesn't engulf specific type of molecules. It's basically spontaneous and takes place continuously. And for this reason, we sometimes refer to pinocytosis as cell drinking because it takes place spontaneously and the end result is the uptake of extracellular fluid. 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.