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Protozoa Structure and Function (view source)
Revision as of 19:02, 18 May 2010
, 19:02, 18 May 2010Created page with '*Motile *Protozoa possess all the 'usual' organelles which are found in most animal cells **Nucleus, endoplasmic reticulum, mitochondria, Golgi bodies and lysosomes *Protozoa …'
*Motile
*Protozoa possess all the 'usual' organelles which are found in most animal cells
**Nucleus, endoplasmic reticulum, mitochondria, Golgi bodies and lysosomes
*Protozoa also possess other cellular structures, organelles and sub-cellular structures which enable an '''independent existence''' to be led
*Cilia
**Fine, short hairs covering the protozoal surface each arising from a basal body
**Hairs beat in unison to enable the protozoa to move
**Wafts food towards the '''cytostome''' (mouth opening)
**E.g. ''Balantidium''
*Flagellum
**Contractile fibre arising from a basal body
**Contracts in a whip like motion to propel protozoa
**Attached to body of some protozoa by an '''undulating membrane'''
**During movement, the organism's shape is maintained by microtubules in the pellicle
**E.g. ''Trypanosoma''
*Pseudopodia
**Extensions of the cellular cytoplasm
**Cytoplasm flows into the pseudopodia allowing movement of the protozoa
**Also acts in a phagocytic manner surrounding food particles and enclosing it in a vacuole
**E.g. ''Entamoeba''
*Gliding
**No obvious means of locomotion
**E.g. ''[[Eimeria spp.|Eimeria]]''[[Category:Protozoa]]
*Protozoa possess all the 'usual' organelles which are found in most animal cells
**Nucleus, endoplasmic reticulum, mitochondria, Golgi bodies and lysosomes
*Protozoa also possess other cellular structures, organelles and sub-cellular structures which enable an '''independent existence''' to be led
*Cilia
**Fine, short hairs covering the protozoal surface each arising from a basal body
**Hairs beat in unison to enable the protozoa to move
**Wafts food towards the '''cytostome''' (mouth opening)
**E.g. ''Balantidium''
*Flagellum
**Contractile fibre arising from a basal body
**Contracts in a whip like motion to propel protozoa
**Attached to body of some protozoa by an '''undulating membrane'''
**During movement, the organism's shape is maintained by microtubules in the pellicle
**E.g. ''Trypanosoma''
*Pseudopodia
**Extensions of the cellular cytoplasm
**Cytoplasm flows into the pseudopodia allowing movement of the protozoa
**Also acts in a phagocytic manner surrounding food particles and enclosing it in a vacuole
**E.g. ''Entamoeba''
*Gliding
**No obvious means of locomotion
**E.g. ''[[Eimeria spp.|Eimeria]]''[[Category:Protozoa]]