12 s061101 c_meet the scientists
TRANSCRIPT
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MEET THE SCIENTISTS DEVELOPING THE CELL THEORY
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WHAT IS A CELL?
The cell is the basic unit of structure and function in living organisms, including plants and animals.
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ALL LIVING THINGS HAVE CELLS.
Plants Animals
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TOOL USED TO VIEW CELLS
The microscope is used to magnify extremely small objects.
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TIMELINE - 1590
Hans and Zacharias Janssen (1590)
Dutch lens grinders
Father and son
Produced first compound microscope (2 lenses)
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TIMELINE - 1665
Robert Hooke (1665) English scientist
Looked at a thin slice of cork through a compound microscope and observed tiny, hollow room-like structures.
He called them cells, but he only saw the outer cell walls because the cork cells were not alive.
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TIMELINE - 1680
Anton van Leeuwenhook (1680)
Dutch amateur scientist
Looked at blood, rain water, and scrapings from teeth through a simple microscope.
He called the structures he saw “animalcules”.
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TIMELINE - 1838
Matthias Schleiden (1838)
German botanist
viewed plant structures under a microscope and discovered that they were made of cells.
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TIMELINE - 1839
Theodor Schwann (1839)
German zoologist
viewed animal tissue taken from animal organs under a microscope and discovered the tissue was made of cells.
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TIMELINE - 1855
Rudoph Virchow (1855)
German physician
Stated that living cells come only from other living cells (This is a part of cell theory.)