Medical Lad

Structure of the cell INTRODUCTION  Cells are basic units of life. All living organisms are com- posed of many blocks of cells. Each single has all the characteristics of life. Cell is defined as structural and functional unit of the living body. The space outside the cell is called extracellular space. General Characteristics of Cell  Each cell in the body:  1.  Needs nutrition and oxygen. 2.  Produces its own energy necessary for its growth, repair and other activities. 3.  Eliminates carbon dioxide and other metabolic wastes.  4.  Maintains the medium, i.e, the environment for its survival.  5.  Shows immediate response to the entry of invaders such as bacteria or toxic substances into the body.  6.  Reproduces by division. There are some exceptions such as neuron, which do not reproduce.  TISSUE  Tissue is defined as the group of cells having similar function. There are many types of tissues in the body. All the tissues are classifie