Cell
Theory
Schleiden, Schwann and Radolf
Virchow introduced the cell theory, based on the facts revealed by
observing different live tissues through the microscope.
The contents
of the cell theory are as follows.
•
The
structural and functional unit of life is the cell
•
All
organisms are made up of one or more cells
•
New
cells are formed from preexisting cells
Concept
of the Cell
•
The
cell is the smallest structural unit of the organization of the living body.
•
The
organisms composed of a single cell are called unicellular organisms and those
of many cells are called multicellular organisms.
•
Cells
perform different functions in the body.
• The cells differ from one another from their shape, size and function. Except few occasions, mostly cells are not visible to the naked eye. Therefore they have to be observed using the light microscope.
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