Cell Theory
Storyboard Text
- Hi everyone! Today I am going to be telling you about the amazing scientist behind the creation of cell theory!
- Cell theory cell theory is a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells
- Our story begings here in 1665, when English physicist, Robert Hooke, discovered cells through observing corks with a microscope.
- His discovery led to the understanding that cells are the smallest units of life and all organisms are composed of one or more cells. He was also the one to coin the word cell!
- Next we meet our friend Robert Brown! He discovered the nucleus and it's role in 1831!
- His discovery helped to develop the theory that all living organisms are composed of cells, and cells come from pre-existing cells.
- Now we jump forward to our next major discovery! In 1838, Matthias Schleiden, a German botanist, concluded that all plant tissues are composed of cells and that an embryonic plant arose from a single cell.
- Schleiden was one of the first German biologists to accept Charles Darwin's theory of evolution.
- "The cell is the basic building block of all plant matter and cells are organisms and all organisms consist of one or more cells."
- Next up is Theodor! Theodor Schwann was a German physician and physiologist. His most significant contribution to biology is considered to be the extension of cell theory to animals.
- He defined the cell as the basic unit of animal structure.
- "Just as animals are unable to arise without previously existing animals, cells are unable to arise without previously existing cells."
- Finally, we have German pathologist and statesman, one of the most prominent physicians of the 19th century, Rudolf Virchow. He discovered all cells come from other cells.
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