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Encyclopedia > Pseudopod

Pseudopods or pseudopodia (false feet) are temporary projections of eukaryotic cells. Cells having this faculty are generally referred to as amoeboids. Kingdoms Animalia - Animals Fungi Plantae - Plants Protista Alternative Phylogeny Unikonta    Opisthokonta    Amoebozoa Bikonta    Apusozoa    Cabozoa       Rhizaria       Excavata    Corticata       Archaeplastida       Chromalveolata Animals, plants, fungi, and protists are eukaryotes (IPA: ), organisms with a complex cell or cells, where the genetic material is organized into a membrane-bound nucleus or nuclei. ... Amoeba (Chaos diffluens) Foraminiferan (Ammonia tepida) Heliozoan (Actinophrys sol) Amoeboids are cells that move or feed by means of temporary projections, called pseudopods (false feet). ...

Contents

Formation

First, the cell surface extends a membrane process, termed a lamellipodium. Polymerization of actin takes place and form filaments at the leading edge, which subsequently will blend into one another to form networks. It is supposed that actin polymerization is at the origin of the force propelling the cell forwards. An example of alkene polymerisation, in which each Styrene monomer units double bond reforms as a single bond with another styrene monomer and forms polystyrene. ... G-Actin (PDB code: 1j6z). ...


Function

Mechanical role

Pseudopods are one of the three locomotion modes of unicellular organisms (together with flagella and cilia). In a general sense, locomotion simply means active movement or travel, applying not just to biological individuals. ... A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). ... A flagellum (plural, flagella) is a whip-like organelle that many unicellular organisms, and some multicellular ones, use to move about. ... cross-section of two cilia, showing 9+2 structure A cilium (plural cilia) is a fine projection from a eukaryotic cell that constantly beats in one direction. ...


Sensory role

Pseudopods also capture prey by phagocyte. Phagocytosis pseudopods have arisen in a number of different protist groups, but also in some cells (phagocytes) in multicellular organisms. A phagocyte is a cell that ingests and destroys foreign matter such as microorganisms or debris via a process known as phagocytosis, in which these cells ingest and kill offending cells by a process analogous to cellular digestion, usually using lysosomes which carry potent enzymes that digests cell components such... Typical phyla Chromista Heterokontophyta Haptophyta Cryptophyta (cryptomonads) Alveolata Dinoflagellata Apicomplexa Ciliophora (ciliates) Excavata Euglenozoa Percolozoa Metamonada Rhizaria Radiolaria Foraminifera Cercozoa Archaeplastida (in part) Rhodophyta (red algae) Glaucophyta (basal archaeplastids) Amoebozoa Choanozoa Many others; classification varies Protists (IPA: ) are a diverse group of organisms, comprising those eukaryotes that are not animals... A phagocyte is a cell that ingests and destroys foreign matter such as microorganisms or debris via a process known as phagocytosis, in which these cells ingest and kill offending cells by a process analogous to cellular digestion, usually using lysosomes which carry potent enzymes that digests cell components such... Multicellular organisms are those organisms containing more than one cell, and having differentiated cells that perform specialized functions. ...


Morphology

Pseudopods can be classified into several varieties according to their appearance:

  • Lobopodia are bulbous, short and blunt in form, very typical of Amoebozoa.
  • Fillopodia are more slender and filiform with pointed ends, consisting mainly of ectoplasm. These formations are supported by microfilaments.
  • Reticulopodia, also known as reticulose pseudopods, are complex formations where individual pseudopods are blended together and form irregular nets.
  • Axopodia are thin pseudopods containing complex arrays of microtubules and are enveloped by cytoplasm. Axopodia are responsible for phagocytosis, by rapidly retracting in response to physical contacts. They are observed in radiolaria and heliozoa.

Subgroups Mycetozoa(slime moulds) Archamoebae    Pelobiontida    Entamoebida Gymnamoebia Various others The Amoebozoa are a major group of amoeboid protozoa, including the majority that move by means of internal cytoplasmic flow. ... An ectoplasm (ghost) In cell biology, ectoplasm (outer plasma) refers to the outer regions of the cytoplasm of a cell. ... This article or section should be merged with actin Microfilaments or actin filaments are made up of two twisted monomeric actin subunits. ... Microtubules are one of the components of the cytoskeleton. ... It has been suggested that Cytoplast be merged into this article or section. ... Possible classes Polycystinea Acantharea Taxopodea Radiolaria are amoeboid protozoa that produce intricate mineral skeletons, typically with a central capsule dividing the cell into inner and outer portions, called endoplasm and ectoplasm. ... Heliozoa, or sun animalcules, are roughly spherical amoeboids with many stiff, microtubule-supported projections called axopods radiating outward from the cell surface. ...

Other meanings of the word (The Abyss)

In the film The Abyss, a creature called a pseudopod was acclaimed as one of the first successful uses of CGI in film.[citation needed] The Abyss is an award-winning science fiction film from 1989, written and directed by James Cameron, starring Ed Harris, Mary Elizabeth Mastrantonio, and Michael Biehn. ...


See Also

Pseudopod: The world's first horror podcast book Pseudopod is the worlds first horror podcast magazine. ...


  Results from FactBites:
 
Pseudopod (51 words)
Pseudopods or pseudopodia are temporary projections of eukaryotic cells.
Cells which have pseudopods are generally referred to as amoeboid.
They have arisen in a number of different protist groups, and occur in some cells in multicellular organisms.
  More results at FactBites »

 
 

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