Concept Of Body Organisation

  • Dr. Gaurav Rana, Dr. Datta Bandapalle


The human organism being as single cell, the fertilized ovum, which gives rise to the  entire  body.  The body is composed of various types of specialized cells. Cells, which have a similar origin and structure and sub- serve the same general function, are frequently found grouped together to from t issues. Sometimes a single cell or tissue may function fairly  independently  of all others but more  commonly   a number  of tissue are intimately associated to form larger  units called  organs  e. g. heart, liver, kidney, pancreas, etc. Finally, the last order in classification is that of the organ system, a collection of organs which  sub- serve  an overall function. For example, the kidney,  the  bladder  and the  tubes leading from the kidneys to the  bladder  and from  the  bladder to the exterior constitute the urinary system. While unicellular organisms like amoeba interacts directly with the external and internal environment. For example hepatic cells of amoeba and human both get required energy from the breakdown of organic  nutrients   and   the chemical reactions  resultant of intracellular  processes are specially effective on hepatic cells. Besides, we can observe similarities in both types of cells.  The only difference  is that  amoeba takes necessary  oxygen  and gives  up carbon dioxide directly from and to the  atmosphere  while humans  depend  upon  the internal environment for these. A treatable human, who is organized  from  reproductive  cells, depends upon internal environment, which is given below.01