1. Cell Theory
SC.912.L.14.1

2. Essential Question
Why do scientists believe that all living things are made of cells?

3. What does this have to do with science?

4. Scientists leading to Cell Theory
1665
Robert Hooke
1674 Anton van Leeuwenhoek
1838 Schleiden
1839 Schwann
1855
Virchow
While these scientists were working they shared their ideas with others.
Other scientists were able to perform experiments that confirmed their conclusions.

5. Hooke Used a simple microscope
Saw little chambers in a piece of cork and called them “cells”.

6. Leeuwenhoek Created over 500 microscopes
Described seeing “animalcules”

7. Schleiden and Schwann
Concluded that all plants and animals were made of cells.

8. Virchow
Concluded that new cells could be produced only from the division of existing cells.

9. The conclusion The cell theory states:
All living things are composed of cells.
Cells are the basic units of structure and function in living things.
New cells are produced from existing cells.

10. Exit Question.
Why do you think the concept of cells was not studied before Hooke?