1. History of Cells
Chapter 7 Sect. 1

2. History of Cells Recall: 7 Characteristics of Life
Examine the tip of your finger….What do you see?
This was all made possible by a Dramatic Advance in Technology
Invention of the Microscope

3. Robert Hooke Created the first microscope in the mid-1600’s (1665)
Created an early compound microscope (30x magnification)
Examined a thin piece of cork, a plant material
Observed 2 things:
Many small boxes
Hollow, empty chambers

4. Hooke’s Experiment

5. Anton von Leeuwenhoek Created his own microscope in 1674
Used a single lens microscope (200x) to observe water
Revealed a world of tiny living organisms
Why was his microscope so good?
It was simple!

6. Leeuwenhoek’s Experiment

7. Cell Theory
150 years of experiments passed until a board of scientists accepted that cells were the basic units of life
Three scientists provided final experiments that delivered us the Cell Theory!

8. Cell Theory
1838: Matthias Schleiden concluded that all plants were made up of cells
1839: Theodor Schwann concluded that all animals were made up of cells
1855: Rudolf Virchow concluded that new cells could be produced only by the division of existing cells

9. Cell Theory These discoveries summarized the cell theory:
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