The pseudopodes are deformations of the plasmic Membrane which make it possible a cell to be nourished and to move while crawling on a support in a given direction.
Characteristics
One observes the production of pseudopodes only at the cells Eucaryote S, more precisely at the animal cells and Protiste S (for example: the Ameba S).These deformations of the external membrane are caused by internal pressures of the Cytoplasme, modulated by a contractility of certain parts of the membrane (underlain of a fiber network of Actine, similar to the contractions of the microfilaments of actine so present in the muscular cells animal) accompanied by the relaxation by other sites (located in front of the movement).
In fact the movements amiboïdes cytoplasm allow displacement. The cytoplasm exists in 2 forms: - the endoplasme (fluid) - the esctoplasme (rigid) The endoplasme and the ectoplasm are rigidified then are fluxed and etc, and thus the movement is done.
See too
Simple: Pseudopods
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