Pseudopodia are temporary projections of the cell membrane of eukaryotic cells. It means that it is not a fixed structure.

Definition

A temporary arm like a projection of the eukaryotic cell membrane is called pseudopodia. It is temporarily filled in the cytoplasm organelle of the cell. Pseudopods extend and contract by the reversible assembly of actin subunits into many microfilaments.

Formation

In the cell body of an organism, pseudopodia are formed when the actin proteins polymerize and form chains. Cell protrusion is directed by a protrusive force by actin polymerization. Actins forming long chains presumably provide the force that accelerates the cell membrane to the direction of the movement.