Concept Of Body Organisation
Abstract
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