English physicist Robert Hooke, who described cork and other plant tissues in 1665, introduced the term cell because the cellulose walls of dead cork cells reminded him of the blocks of cells occupied by monks.

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​The history of cell theory is a history of the actual observation of cells.​

The inspired Dutch microscopist Antonie van Leeuwenhoek, beginning in 1673, discovered blood cells, spermatozoa, and a lively world of “animalcules.”​

Cell theory was not formulated for nearly 200 years after the introduction of microscopy.

​CELL THEORY

1. All organism are composed of one or more cells

2. The cell is the basic unit of structure and organization in organism.

3. All cells come from preexisting cells

4. Hereditary information is found inside the cell and is passed from generation to generation.

5. Metabolism and energy flow occur within cells.

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​Additional aspects

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