1. Cell Theory

2. Zacharias Janssen
1590s
Dutch Spectacle maker, who made one of the first compound microscopes
Could magnify objects 3 to times larger

3. Robert Hooke
1665 England
Coined the term “cell” to describe the chambers in cork
Cell walls look like little rooms in the monastery

4. Anton van Leeuwenhoek 1670s Holland (isn’t that weird…)
First compound light microscope
First to see bacteria, called them “animacules”
Studied pond water, blood, tooth scrapings

5. Matthias Schlieden
1839 Germany
All plants are made of cells

6. Theodor Schwann 1839 Germany All animals are made of cells
Once, while talking at dinner with his friend, Matthias Schleiden, Schwann compared the parts of plants and animal cells, and they realized that they had similar parts!

7. Rudolf Virchow 1855 Germany First to see leukemia cells
Has an autopsy method named after him
Cells can only arise from
pre-existing cells

8. From the work of these and many other scientists, we have the Cell Theory

9. Cell Theory All living things are made up of at least one cell.
The cell is the basic unit of structure and function in living things.
Cells come only from other living cells.

10. How did the microscope change human understanding of life?
Why were cells not discovered before the microscope was invented?
Many diseases, such as strep throat, are caused by microscopic organisms. Why might a microscope be an important tool for a doctor?
Who’s work was the most important in the formation of the cell theory? Justify your answer with details from your notes and/or video.

11. Levels of Organization in Multicellular Organisms
Organelles  Cells  Tissues  Organs  Organ Systems  Organism* * An organism can be unicellular