Phagocytosis

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Phagocytosis is the process by which a [[Cell|cell]] engulfs solid material. The [[Molecule|molecule]] is then internalized in a&nbsp;vesicle of plasma membrane ([[Phagosome|phagosome]]) which fuses with a [[Lysosome|lysosome]] for destruction, any undigested remains of the molecule (eg. [[Bacteria|bacterium]]) are removed by [[Exocytosis|exocytosis]] and the products of digestion are absorbed into the cytoplasm. It occurs in the [[Immune system|immune system]], and is carried out by [[Phagocytes|phagocytes]] such as [[Macrophage|macrophages]] which are involved in the [[Innate immune response|innate immune response]]&nbsp;<ref>http://www.ncbi.nlm.nih.gov/pubmed/10358769</ref>.  
 
Phagocytosis is the process by which a [[Cell|cell]] engulfs solid material. The [[Molecule|molecule]] is then internalized in a&nbsp;vesicle of plasma membrane ([[Phagosome|phagosome]]) which fuses with a [[Lysosome|lysosome]] for destruction, any undigested remains of the molecule (eg. [[Bacteria|bacterium]]) are removed by [[Exocytosis|exocytosis]] and the products of digestion are absorbed into the cytoplasm. It occurs in the [[Immune system|immune system]], and is carried out by [[Phagocytes|phagocytes]] such as [[Macrophage|macrophages]] which are involved in the [[Innate immune response|innate immune response]]&nbsp;<ref>http://www.ncbi.nlm.nih.gov/pubmed/10358769</ref>.  
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For some [[Eukaryotes|Eukaryotes]], mainly unicellular Eukaryotes, this is a key method of obtaining nutrients. This includes [[Amoebas|Amoebas]] and [[ciliated protozoa|ciliated protozoa]].&nbsp;<ref>Jeff Hardin, Gregory Bertoni, Lewis J. Kleinsmith (2012) Becker's World of the Cell, Eighth Edition</ref>
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The process of phagocytosis involves the [[macrophage|macrophage]] beginning to encase the [[pathogen|pathogen]] or substance via [[endocytosis|endocytosis]]. Once the [[macrophage|macrophage]] has engulfed the substance, a phagosome is formed containning the substance. The substance is then broken down by the fusion of the phagocytic vesicle ([[phagosome|phagosome]]) and the [[lysosome|lysosome]] vesicles which contain [[oxidase|oxidase]] and [[proteases|proteases]], this process is called [[phagolysosome|phagolysosome]]. <ref>http://courses.washington.edu/conj/bloodcells/phagocytosis.htm</ref>&nbsp;<br>
  
 
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=== Also see  ===
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Latest revision as of 18:07, 2 December 2015

Phagocytosis is the process by which a cell engulfs solid material. The molecule is then internalized in a vesicle of plasma membrane (phagosome) which fuses with a lysosome for destruction, any undigested remains of the molecule (eg. bacterium) are removed by exocytosis and the products of digestion are absorbed into the cytoplasm. It occurs in the immune system, and is carried out by phagocytes such as macrophages which are involved in the innate immune response [1].

For some Eukaryotes, mainly unicellular Eukaryotes, this is a key method of obtaining nutrients. This includes Amoebas and ciliated protozoa[2]

The process of phagocytosis involves the macrophage beginning to encase the pathogen or substance via endocytosis. Once the macrophage has engulfed the substance, a phagosome is formed containning the substance. The substance is then broken down by the fusion of the phagocytic vesicle (phagosome) and the lysosome vesicles which contain oxidase and proteases, this process is called phagolysosome. [3] 

Also see

Endocytosis

Pinocytosis

References

  1. http://www.ncbi.nlm.nih.gov/pubmed/10358769
  2. Jeff Hardin, Gregory Bertoni, Lewis J. Kleinsmith (2012) Becker's World of the Cell, Eighth Edition
  3. http://courses.washington.edu/conj/bloodcells/phagocytosis.htm



 

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