Endocytosis

Definition

Endocytosis is a cellular process by which cells internalize molecules (such as proteins) or particles from their surroundings by engulfing them in a membrane-bound vesicle. This mechanism allows the cell to import substances that cannot pass through the cell membrane directly.

Related terms

Phagocytosis:

A type of endocytosis where cells engulf large particles or microorganisms, essentially "eating" them.

Pinocytosis:

A form of endocytosis where cells ingest extracellular fluid and its dissolved solutes, often referred to as "cell drinking."

Exocytosis:

The process by which cells expel materials in vesicles from the cell into the extracellular environment, effectively the reverse of endocytosis