The word comes from the Greek “Pino“, which means ‘to drink’.
Pinocytosis is a biological process of taking in fluid together with its contents into the cell by forming narrow channels through its membrane that pinch off into vesicles, and fuse with lysosomes that hydrolyze or break down contents.
The main function is to absorb extracellular fluids.
They play an important role in the uptake of nutrients along with the removal of waste products and signal transduction.