THE CELL INTRODUCTION v The cell is the smallest structural and functional unit of the body. v The human body is made up of millions of cells of different types, each with its own form and functions. v Human body is made up of 75 trillion cells. v The cells are organized in tissues, tissues combine to form organs, and organs work together in organ systems. v Cell biology is the study of cellular structure and function. DEFINITION : v A cell is the structural and functional unit of living organism. v A cell is a minute (jelly like) mass of protoplasm containing a nucleus held together by a cell membrane. STRUCTURE OF CELL The cell is made up of the following structures. 1. Cell membrane (or) Plasma membrane. 2. Nucleus. 3.Cytoplasm: THE SIMPLE CELL 1. CELL MEMBRANE OR PLASMA MEMBRANE. v The cell membrane is a protective sheath of the cell body v ...
