The Cell Theory consists of three principles: - All living things are composed of cells.- Cells are the basic units of life.- Cells come from other cells.
Many people in history helped developed this theory.
Cell Theory
Contribution:Discovering the tiny boxlike sections on a cork, Hooke began to understand that cells are the smallest units of life.
Robert Hooke
1635-1703
Contribution:Brown discovered the nucleus in the cell.
Robert Brown
1733-1858
Matthias Schleiden
Contribution:Schleiden came to the conclusion that all plant tissues are made of cells and an embryonic plant came from a single cell. He declared that the basic building block of plant matter are cells.
1804-1881
Contribution:Schwann proposed the cell theory, stating that all plant and animal tissues are composed of cells. Also that all cells in an organism are identical.
Theodor Schwann
1810-1882
Contribution:Virchow made it more clear that diseases occur at the cellular level. He came to this conclusion using the theory that all cells come from pre-existing cells.