Tuesday 29 December 2015

LEVEL OF ORGANISATION OF CELL IN BODY

* all members of animalia are multicellular and they exibit different level of organisation.
*cellular level-in sponges the cell are arranged in loose aggeregation.
   tissue level- in coelentrata the cell arrangement are more complex. here, the cell performing the                             same function are arranged into tissue.
   organ level-in platyhelminthes the tissue are grouped together  to form organs. each organ                                       specialised for a particular function.
   organ system level-in animals like annelida,arthropods,mollusca,echinodermata and                                               chordates,organ are associated to form funtion system. each system concern with a                              specific physiological function.this is called organ system level.
*in organ system level, the organism are classified on various basis like open and close circulatory system, complete and incomplete digestive system etc.



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