In details

Endocytosis (continued)


Pinocytosis

In this case, the vesicles are small and the cell eats soluble molecules that would otherwise have difficulty penetrating the membrane.

The pinocytic mechanism involves energy expenditure and is very selective for certain substances such as salts, amino acids and certain proteins, all of them water soluble.

This process, which occurs in several cells, is of considerable importance to medicine: further study may allow the treatment of cell groups with substances that do not generally penetrate the cytoplasmic membrane (by diluting them in a solution containing a pinocytosis, such as albumin, causing the substance to follow the albumin into the cell and perform its function there).