What is meant by the statement that the cell is the functional unit of life?
A Human body contains about 100 trillion or more of cells. Each of the 100 trillion or more cells in a human being is a living structure that can survive indefinitely and, in most instances, Can even reproduce itself provided its surrounding fluids contain appropriate nutrients.
The specialization of the cells in the various organs is very great, and no cell can be called ‘typical’ of all cells in the body. However a number of structures (organelles ) are common to most cells.
From these point of view, cell is regard as the structural and functional unit of the living organism.